Hi guys
Can someone help me out understand something? When I bought the pace I really was not aware that it had such a low resolution when the watch was not active. I know it uses a transreflective LCD.
I understand that amoled screens waste more battery for lighter colors because black does not turn on any pixels.
LCDs on the other hand waste more battery regardless of color because it is the backlight that consumes battery right?
What about this transreflective LCD? I don't understand why the watch uses an 8 bit color pallet on the lockscreen and why does this save battery? Shouldn't the backlight be the only thing that consumes more battery? If it is just displaying and image (whether it is high or low resolution), shouldn't the battery consumption be the same for both?
Can someone clarify this for me? I tried searching but could not find anything..
Transflective mode reflects ambient light without using the back light hence the name.
nupi said:
Transflective mode reflects ambient light without using the back light hence the name.
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I know that, but that's not what I asked. On traditional LCDs it is the backlight that consumes battery regardless of the resolution correct? On transflective screens, whether the backlight is active or not, why does the watch switch to low resolution on lockscreen and why does that affect battery? Because on traditional LCDs the resolution displayed does not affect battery right?
I don't think it switches to low resolution (otherwise small text would become unreadable which clearly is not the case) . It's just colors looking washed out because now it's only reflecting light.
nupi said:
I don't think it switches to low resolution (otherwise small text would become unreadable which clearly is not the case) . It's just colors looking washed out because now it's only reflecting light.
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I don't know it it switches to low resolution but from what i read it changes to an 8-bit color pallet, that is why it looks "low quality". What I wanted to know is why does that save battery since traditional LCDs don't have this issue..
This interested me as well and I found out it uses a MiP (memory-in-pixel) transflective LCD display (LPM013M091A). I haven't done much research on how exactly it saves power between those two modes but basically it's a memory limitation in a display itself so it switches between 8 or 262k color palette. As I understand it's not 8-bit color but actually just 8 colors in low power so that's why it only looks like low resolution.
migueldbr said:
I don't know it it switches to low resolution but from what i read it changes to an 8-bit color pallet, that is why it looks "low quality". What I wanted to know is why does that save battery since traditional LCDs don't have this issue..
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I think it just uses the 8 color mode to improve contrast and be more readable in low light as the background light is off...
I don't think so. This is just how MiP displays work. They save power similarly to e-paper displays like the ones used in Pebble watches.
According to specifications in MiP mode (8 colors) the consumption is 0.8mW and in Normal Driving mode (262k colors) 9mW for still image and 13mW for moving image and backlight is unrelated and separate from display modes and contrast is the same but as I understand in MiP mode it can only display the maximum intensity pixel colors so it may look sometimes (depending on a watchface and ambient light) that contrast only seems better.
There are also MiP only mode displays as well. The one used in this watch is a hybrid type and it's just a hardware limitation in a display itself for these low power consumption LCDs.
Also maybe it's good to keep in mind that these also suffer from burn-ins if the same image is displayed for prolonged time so it might be prudent to change watchfaces from time to time.
lfom said:
I think it just uses the 8 color mode to improve contrast and be more readable in low light as the background light is off...
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TumiBC said:
I don't think so. This is just how MiP displays work. They save power similarly to e-paper displays like the ones used in Pebble watches.
According to specifications in MiP mode (8 colors) the consumption is 0.8mW and in Normal Driving mode (262k colors) 9mW for still image and 13mW for moving image and backlight is unrelated and separate from display modes and contrast is the same but as I understand in MiP mode it can only display the maximum intensity pixel colors so it may look sometimes (depending on a watchface and ambient light) that contrast only seems better.
There are also MiP only mode displays as well. The one used in this watch is a hybrid type and it's just a hardware limitation in a display itself for these low power consumption LCDs.
Also maybe it's good to keep in mind that these also suffer from burn-ins if the same image is displayed for prolonged time so it might be prudent to change watchfaces from time to time.
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Click to collapse
Great info, thanks. But why 8 colors mode would use less power than 262k colors if it's the same resolution? Could you please link to the source of the power consumption in both color modes? TIA
EDIT: I've found this: http://www.j-display.com/product/pdf/Datasheet/6LPM013M091A_specification_ver03.pdf
So it seems that they are two completely different modes: MiP with 8 colors and transflective with 262k colors.
Yea, that's the display technical specifications. This is where I got the power consumption modes:
http://www.j-display.com/product/pdf/Leaflet/6LL_1.34_round_LPM013M091A.pdf
lfom said:
Great info, thanks. But why 8 colors mode would use less power than 262k colors if it's the same resolution? Could you please link to the source of the power consumption in both color modes? TIA
EDIT: I've found this: http://www.j-display.com/product/pdf/Datasheet/6LPM013M091A_specification_ver03.pdf
So it seems that they are two completely different modes: MiP with 8 colors and transflective with 262k colors.
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Related
Hi all,
After reading this, especially this part:
"Suggestions for Google:
1. Eliminate the primitive 16-bit display interface and fix the Browser, Gallery and other applications.
2. The White Point is too blue, lower it to D6500, which will improve color accuracy, slow the aging of the Blue OLED, reduce power consumption, and improve battery run time.
3. Improve the factory display calibration to correct the large color and gray-scale tracking errors and the irregular and non-standard display contrast and Gamma.
4. The color saturation of the display is way too high. You can trade this excess color saturation to boost the screen brightness by adjusting the software color calibration matrices. This will also improve the color accuracy of the display.
5. Take full advantage of the OLED display: the ambient light sensor now just controls the screen brightness. You should also use it to control the gamma, color gamut, color saturation, and edge enhancement so that in low ambient light the display delivers beautiful and accurate image and picture quality, but as the ambient light increases slowly turn up these parameters to counter-balance the washed out appearance of the images in bright ambient light. Also add a display Vivid or Pizzazz control because some people prefer punchy images and pictures, while other people do not.
Nexus One Conclusion: The Nexus One Display Looks Like a Prototype
The Nexus One OLED display has many spectacular qualities, but it is also loaded with lots of rough edges, hasty unfinished beta display drivers and Android software including principal applications like the Browser and Gallery, poorly implemented image processing, poor system integration together with sub-standard factory display calibration. It really looks and behaves like a prototype for a very nice future display, not a finished production display for a world class mobile device that Google markets it to be. It will be interesting to see the degree to which existing units will be corrected and improved with software updates."
My toughts are: could it be possible to tweak video drivers, or at least modify gallery and browser apks to achieve a better viewing quality?
Someone give this man a beer I couldn't have said that better myself.
Sent from my Nexus One using XDA App
+1000
Any devs watching this?
Wow...even more improvement possibilities! Modding this phone seems endless!
Yeah, I seriously believe we could improve display performance with some tweaks. I noticed that on the iphones 2g,3g,3gs and 4g, the screen kept changing color and it really did make a difference. Like the 3g screen seemed a bit yellow and 3gs was more natural and they kept on improving.
I would like to hear some dev's opinion because I think it's pretty hard to modify video drivers, as we are seeing in the "porting video drivers" thread...so I'm not too optimist...but let's see what happens
Sent from my Nexus One using XDA App
As a pro video calibrator I would LOVE to have an app that allows me to change the RGB levels so I can set the grayscale.
I will watch this thread with great interest. Here is to hope.
I think the start is with the rendering tweaks that is being used in cm6. Where that is, I have no clue on the technical specifications..... Sorry.
How many of the issues are hardware related though? They're certainly not going to be updating those.
I'm pretty sure I read that article a few months ago, Google appear to be quite reluctant to do anything specific to the N1 and prefer to just keep trucking along with the generic AOSP development. If anything that can be done is going to happen, it'll be due to the clever developers on this and other forums.
The N1 display looks like it's permanently in store-presentation mode, very sharp and contrasty, unfortunately it's not very realistic. If changes can be made in software to improve things, that'd be great, but I doubt it'll be Google doing it.
grayscale
Would it be possible to have a setting to make the entire display grayscale instead of color? If so, would this then allow us to punch up the brightness past it's default levels? Battery life is not my concern. Seeing my screen in the bright sun is though
Alright, I checked it out using the patch that enables nightvision mode in later CM builds, a calibration profile can most likely be done. I'll get my colorimeter tomorrow and use changing linear transformations to turn one of the modes into a calibrated profile. It's up to Cyanogen whether or not it should be added "officially," but I can just overwrite salmon or something and post an update.zip in the meantime if I can get it to work.
Lowering the contrast (and calibrating for that matter) will lower the total colors that can be rendered, so you'd have to keep that in mind. I'm not sure if the screen is 16 bit minimum (at the lowest brightness and thus the more detail the brighter it is) or 16 bit maximum (at highest brightness) as darkening the "backlight" would just narrow the gamut on the device, anyone know? The gamut may already be too narrow to justify a LUT, but I'll see soon.
From what I know, the system is capable of 24bit color, but only 16 bit native. You see, OLED displays have really high refresh rates, so they show the color above and below the target in the right ratios to trick the eye. I don't think the system does these calculations when it expects the screen to move, too high a load, and that's why tapping on the screen in the browser changes colors. This is probably just the application using the wrong settings with regards to it.
The pentile matrix can show fonts really nicely if it has the right font hinting. I've heard that it doesn't, however. I'm not sure where you'd find the best place to go about that, but it's probably out of the kernel and thus outside of my knowledge..
Edit: heavily edited for cleanliness and new knowledge.
Great contribution Storm...do you think we can correct issues noticed in FIGURE 1 (nexus vs iphone comparison) ? It would be AWESOME ...
Maybe should I open a similar thread on cyanogenmod?
knightnz said:
How many of the issues are hardware related though? They're certainly not going to be updating those.
I'm pretty sure I read that article a few months ago, Google appear to be quite reluctant to do anything specific to the N1 and prefer to just keep trucking along with the generic AOSP development. If anything that can be done is going to happen, it'll be due to the clever developers on this and other forums.
The N1 display looks like it's permanently in store-presentation mode, very sharp and contrasty, unfortunately it's not very realistic. If changes can be made in software to improve things, that'd be great, but I doubt it'll be Google doing it.
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we all doubt it...that's why we're unlocking FM radio and add 720p recording...N1 could really have been the iphone killer if Google did the job ENTIRELY...but really seems that N1 is an unfinished prototype, combine this with huge errors (no marketing and online-only distribution) and you have a partial failure, I know it's sad to say...
Still love my N1!
Well, it looks like the calibration profile is going to be [1, .98, .69] [R,G,B] or thereabouts. Can anyone test the temperature with their own calibrator? I'm getting 9300K when we want 6500K, the website noted earlier got 8900K. I'd like a few more test results but I can work with just my own.
I'm going to edit the files and try it out on my phone here soon enough. I can, if I can modify by-pixel colors, calibrate it to a 2.2 gamma, which would lower battery usage and the overly contrasty and cartoony colors significantly. It'll take a while though if it's even possible.
Anyone know any good apps that just show a specified RGB value across most or all the screen?
Edit: Alright, there are two calibration profiles, one for the lowest brightness, one for the highest. The values I'm getting (for the code junkies) are [1, green, .82] for bright screens, and [1, green, .80] for dark screens. The problem is that the level of green is pretty subjective. I can't measure it without doing extensive calculations, but comparing it to my calibrated monitor, .98 or .99 seems good. 1.00 should be ok, as .98 will add banding.
I'll upload the libsurfaceflinger.so with the modified profile for people to test in another thread (to be linked once I make it here)
storm99999 said:
Well, it looks like the calibration profile is going to be [1, .98, .69] [R,G,B] or thereabouts. Can anyone test the temperature with their own calibrator? I'm getting 9300K when we want 6500K, the website noted earlier got 8900K. I'd like a few more test results but I can work with just my own.
I'm going to edit the files and try it out on my phone here soon enough. I can, if I can modify by-pixel colors, calibrate it to a 2.2 gamma, which would lower battery usage and the overly contrasty and cartoony colors significantly. It'll take a while though if it's even possible.
Anyone know any good apps that just show a specified RGB value across most or all the screen?
Edit: Alright, there are two calibration profiles, one for the lowest brightness, one for the highest. The values I'm getting (for the code junkies) are [1, green, .82] for bright screens, and [1, green, .80] for dark screens. The problem is that the level of green is pretty subjective. I can't measure it without doing extensive calculations, but comparing it to my calibrated monitor, .98 or .99 seems good. 1.00 should be ok, as .98 will add banding.
I'll upload the libsurfaceflinger.so with the modified profile for people to test in another thread (to be linked once I make it here)
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This is awesome! I will certainly test tonight with my X-rite i1 Pro meter. Just curious, where are you getting the IRE images from?
wrinklefree said:
This is awesome! I will certainly test tonight with my X-rite i1 Pro meter. Just curious, where are you getting the IRE images from?
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As of now, I don't have IRE images. I just calibrated the white point, and even then, kinda inprecisely. Your data and inputs are valued, but I can't do anything more than a linear equation on the pixels. Currently, I keep red as it is, multiply green by .98, and multiply blue by .82 . It's not accurate, but it's close, and it uses less power. The gamma is still skewed to hell though.
Please look at this post, maybe this has something to do with anything relevant to the ideas presented in this post?
http://forum.xda-developers.com/showthread.php?t=745248
Seems like a good idea
ywindlass said:
Please look at this post, maybe this has something to do with anything relevant to the ideas presented in this post?
http://forum.xda-developers.com/showthread.php?t=745248
Seems like a good idea
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Click to collapse
Of course it's relevant, this thread gave me the idea for that. A few posts up is me debating whether or not it would work.
Does anyone know where I can see an image the compares the different settings of the "Background Effect" setting? I've read that this adjusts the color saturation of the screen. This is a concern to me because I saw the Samsung Infuse in person and the screen was far too saturated for my taste. For just looking at icons and email it was fine. But when looking at photographs, the colors were far too saturated. Sure they "pop", but they're not accurate. I was wondering how the Galaxy S II compared at its different settings.
Thanks.
To be perfectly honest, colours on the GS2 aren't accurate at all. However, if you change the background effect from standard to movie (the lowest setting) it gets close and looks a lot better.
Is it feasible that selecting 'Movie' over 'Dynamic' will aid in power conservation efforts?
I've been using the 'Movie' setting with minimum brightness for almost a week and today I tried the 'Dynamic' setting with full brightness again and after 5 mins I couldn't look at the screen any more, my eyes were in too much pain!
I'm also wondering about the impact that background effects have on the battery. I have seen couple of battery reports of people using 'Movie' and they seemed better than I would have expected after looking at their usage.
Yes movie should save a little power. Dynamic is like"torch" mode which is
The mode shops usually have their tv's set to when selling them to show off
The tv.
My samsung plasma tv has the exact same 3 settings, movie draining the
Least power as it is not as bright as the others. I would think the same principle
Applies to phone screens too.
Just wondering if anyone else noticed yet...
Before the new update you could switch power modes and notice a major decrease in image quality in power savings mode, then notice it get a lot better once switched to balance mode or normal...
Well with the new update it seems to be stuck in the poor image quality mode that it gave before while in power savings mode. Also switching modes has no effect at all on image quality.
You can only get good colors now with super IPS mode turned on.
Maybe it is just your TFP, I had no such issue before or after the update.
Maybe you just didnt notice... Before the update it clearly adjusted brightness and contrast of the screen when in power saving mode...
It no longer does this and seems to be stuck with low contrast and washed out colors. I had no problems before the update because I would use it on balanced mode which let the colors out of the bag. But now with the new update every mode looks washed out.
I noticed that too. I don't know if it is the lower or higher quality, but it doesn't matter that much. All I care about is this stupid dead/stuck pixel.
I think it did adjust brightness but I am not sure it adjusted "quality". And not everyone is going to notice or see a difference because if some people always use auto-brightness then I don't think their screens every changed when they switched power modes (I don't recall my friend's changing).
So while I do think you might be correct that the new update has stopped the screen from changing brightness when you switch between power modes, I am not at all sure about the quality.
I wonder if we can assign screen brightness and quality to the power settings somewhere now? (or could before?)
I remember hearing months ago that Nvidia had this new idea to save battery life with the whole dynamic contrast and brightness thing.
But after using the device as an ereader for a while, the constant flickering was more than I could bare.
I'm glad its gone, now I can read in peace. I didn't notice any change in quality. Color temp perhaps...
No this is not what im talking about, It would change the image quality... not just the brightness...
Making images more detailed and colors more vivid. But its gone now, strange and kinda of sucky...
Any TFP users that knows what im talking about please chime in.
Update:
It seems that the tegra 3 auto image quality is working (not in the modes but according to what your viewing) but I really wish they would just take it out all together..
If you have a dark colored wallpaper your colors will seem washed out because its adjusting the brightness, contrast and colors to be weaker.
If you have a white bright wallpaper your colors will be more vivid, sharper and screen brighter...
This is why the homescreen may appear washed out to some, and others dont see it. It all depends on what colors your viewing.
jzen said:
Just wondering if anyone else noticed yet...
Before the new update you could switch power modes and notice a major decrease in image quality in power savings mode, then notice it get a lot better once switched to balance mode or normal...
Well with the new update it seems to be stuck in the poor image quality mode that it gave before while in power savings mode. Also switching modes has no effect at all on image quality.
You can only get good colors now with super IPS mode turned on.
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Click to collapse
I see what you mean.i just updated for the very first time.Its not poor image quality but when i hit my buttons it doesn't do anything screen stays the same.
Are you able to compare it with another device? Try to have the same icon on your home screen on each device. For me the TFP is noticeable different (even with a white wallpaper). I compared opera,market and google music icons, they seem to have less color and appear washed out on the TFP.
I am glad you noticed what I am talking about with the modes.
Screen brightness adgusts on mine even with auto brightness on which is expected to help battery life, but I see no change in quality of images on mine.
Sent from my Transformer Prime TF201 using Tapatalk
If you didnt notice the modes adjusting this (colors and brightness) before then you may not know what I am talking about. Yes even with auto-brightness off it will adjust brightness but this is not what I am talking about.
Before the update it most defiantly changed the brightness and image quality in low power mode. But not it does not and appears to be stuck in bad image quality mode, If you did not notice this before the update then you wont be able to notice the poor image quality unless you compare it to another android device.
Notice how the colors are off and appear washed out in comparison.
Not sure if I agree. I spent quite a bit of time examining the picture quality prior to the update. I do not see any significant difference in picture quality now.
I have a pretty good eye for picture quality (I was part of a team who set the picture quality for KURO televisions).
I am very pleased with the picture performance of the Prime. What I would love to see is local dimming......
Walkamo
Don't notice a difference. Seems about the same quality to me.
Sent from my Galaxy S2
jzen said:
No this is not what im talking about, It would change the image quality... not just the brightness...
Making images more detailed and colors more vivid. But its gone now, strange and kinda of sucky...
Any TFP users that knows what im talking about please chime in.
Update:
It seems that the tegra 3 auto image quality is working (not in the modes but according to what your viewing) but I really wish they would just take it out all together..
If you have a dark colored wallpaper your colors will seem washed out because its adjusting the brightness, contrast and colors to be weaker.
If you have a white bright wallpaper your colors will be more vivid, sharper and screen brighter...
This is why the homescreen may appear washed out to some, and others dont see it. It all depends on what colors your viewing.
Click to expand...
Click to collapse
bigaj said:
I see what you mean.i just updated for the very first time.Its not poor image quality but when i hit my buttons it doesn't do anything screen stays the same.
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Click to collapse
I think he is finally on to something for once..lol. He is correct in the sense that the major change in contrast from balanced or normal mode to power savings is not apparent anymore. I described this change in contrast and detail in the first week Prime was received. Its not in permanent poor image quality though or power savings look. Before you could hit power savings mode and instantly see the screen contrast change, it wouldn't look as detailed. at first it would look like the brightness dropped a lil but its actually the contrast being adjusted. the icons would have a cartoonish look to them. then once you press balanced or normal mode it would instant switch back. NOW, there seems to be no change at all. like its stuck in either balanced or normal mode color scheme. I just switched various wallpapers, light and dark and colorful ones. its all the same. But there is no loss in quality though of pictures. we just don't see the change anymore immediately. of course when hitting super ips+ mode the colors and screen brightness gonna jump up. it's from the dramatic increase in screen brightness. which for me is too bright, especially at night time.
Good find though Jzen. I didn't notice until you made this thread. as I never use powersavings mode. I only noticed the change in the beginning because it was so prevalant. now the switch isn't anymore. Maybe like he said Tegra3 is doing it all automatically. I can't get it to look like the powersavings mode look like before though. Display still looks as great as it did before. just now the contrast doesn't immediately drop when putting it in powersavings mode. it is seeming like battery life has increased even more though somehow. if this is related to situation mentioned, then its a good thing as there's no loss in quality or contrast. Super ips+ mode is a battery drainer though. keep switching it on and off and you'll see battery life drop in multiple numbers. not just gradually one by one. lol.
---------- Post added at 03:32 AM ---------- Previous post was at 03:21 AM ----------
jzen said:
If you didnt notice the modes adjusting this (colors and brightness) before then you may not know what I am talking about. Yes even with auto-brightness off it will adjust brightness but this is not what I am talking about.
Before the update it most defiantly changed the brightness and image quality in low power mode. But not it does not and appears to be stuck in bad image quality mode, If you did not notice this before the update then you wont be able to notice the poor image quality unless you compare it to another android device.
Notice how the colors are off and appear washed out in comparison.
Click to expand...
Click to collapse
I would notice as I was the first one to mention the drop in contrast weeks ago in various threads and my Different Performance modes thread. it is not stuck in poor image quality mode. you just thinkn that because you don't see the immediate switch and drop in contrast when going into powersavibgs mode. cutting on super ips+ will look dramatic no matter what before or after update so that can't really been used. you are only partially correct in your find. and that is there is no drop on contrast anymore. To me it seems as if its stuck in the balanced or normal mode look from before. cause before when contrast dropped in powersavings, all the icons would look funny and catoonish looking. now it just looks normal no matter what mode you in or wall paper you using.
Walkamo said:
Not sure if I agree. I spent quite a bit of time examining the picture quality prior to the update. I do not see any significant difference in picture quality now.
I have a pretty good eye for picture quality (I was part of a team who set the picture quality for KURO televisions).
I am very pleased with the picture performance of the Prime. What I would love to see is local dimming......
Walkamo
Click to expand...
Click to collapse
The display and picture quality is still great.
ravizzle said:
Don't notice a difference. Seems about the same quality to me.
Sent from my Galaxy S2
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corrrect but if people never switched the modes before then it'll be hard for them to notice there is no longer a drop in contrast when going into powersavings mode. its all looks great now what mode you in. maybe it does it very slowly and gradually in powerssvings mode so the change won't be so noticeable like before. either way Best Display by far of any tablet.
This is definitely not true for me. It is correct that the switching feature is gone, but it is not stuck in low quality mode. my screen looks as awesome as before. maybe you were in powersaving mode before updating and this is another updater bug?
Yes even with auto-brightness off it will adjust brightness but this is not what I am talking about.
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Click to collapse
Sorry if i jump in at this point with wrong subject, but - so this is a known bug on the prime? I already wondered about the automatically de- and reincreasing brightness while scrolling websites even if auto-brightness is turned off...
thomascook said:
Sorry if i jump in at this point with wrong subject, but - so this is a known bug on the prime? I already wondered about the automatically de- and reincreasing brightness while scrolling websites even if auto-brightness is turned off...
Click to expand...
Click to collapse
it is not a bug it is a feature seriously this is really intended, but maybe a bit buggy...
I notice my sig's image looks very blurry in the browser on the Prime than from the browser on my desktop PC.
My PC res is 1920x1080, with the prime having a lower res shouldn't the sig look better only bigger?
I ran the firmware update almost immediately after using my prime for the first time and connecting to my wifi. Didn't even think to look at images through it yet.
OT: I thought the clouds on the background image move. Perhaps I have been wrong from loving all the videos of this online. Will there ever bee a desktop background to have such a feat?
Ok this is my post from few days. So am not crazy? You noticed the same thing?
got a question about the screen. Some times I can sense and see that despite of auto brightness off that the screen adjusts its brightness by itself. It is a little change but my sharp eyes can see this... Do you have a similar thing? it looks like prime adjust the contrast / brightness by it self even if autobrightness mode is off. it happenes while watching youtube, browsing www or playing. it happenes like this on all 3 performance modes but it is more aggresive on battery mode (power saving mode)
Do you notice the similar thing?
i just recieved another update for my prime. The "feature" of brightness instability while scolling seem to be fixed, but yes - after using the power save mode and changing the background image i noticed a really poor color/compression in all backgrounds i set, doesnt matter which one. Restart and changing the modes to high performance or balanced doesnt help, same with setting up a live wallpaper for a while..
Hey, to shoot the question right away; is there a way to properly calibrate your mobile phone screen?
I've searched the forums and googled and haven't found anything I was looking for.
Preferably being able to load color profiles like sRGB or Adobe RGB directly.
I'm not reffering to simple RGB settings or Gamma tweaking.
The reason I'm asking is that I work in 16 bit float mostly and got a perfectly calibrated IPS NEC nicely working with a 12bit LUT and also 2 calibrated TN panel screens.
The final image goes to 8bit PNGs and JPGs with sRGB embedded.
Now the difference between the final outcome on the IPS screen and the TN ones and the one displayed on 4 different android mobile phones I got available for testing is extremely big. So big, that just everything is off.
I thought that embedding color profiles might cause this but using other common profiles or none at all still were extremely off.
I'd like to point out that the image is not necessarily bad, it's just wrong knowing how the end result looks on perfectly calibrated monitors at home or at work.
I'm just surprised that there is close to no information available on how to properly view imagery with embedded profiles considering that the internet is full of fancy mobile phone screen tests and benchmarks nitpicking every single micro millimeter on a screen light years away from normal use conditions.
(At least they don't take into account that probably 60-80% of the images average users view on their mobiles are crappily compressed Facebook .jpgs and the rest photographs shot on mobile cameras..but that's not what the thread is about.)
Is there really no way to counter factory presets?
It's like with TVs on factory or even worse shop presets with shiny oversaturated colors and crushed contrasts, but on TVs you got the chance to turn the crap off at last.
Any idea or guidance would be highly appreciated.
Bump.
I need to calibrate my phone's screen color too, I know I can't expect miracle from the screen of my Xperia Mini, but at least I want to have more natural colors on the screen, Bravia Engine doesn't help at all in color quality, it only increases the sharpness, contrast, and saturation, no better color reproduction at all.
I have SE Hazel, an SE proprietary OS powered phone (DB3350v2), with dispdriver.dat tweaking (only editing the strings for RGB gamma settings inside it), I can make it reproduces far better and more natural colors than my Xperia Mini.
I don't want to make my Xperia Mini screen has the same color reproduction as a calibrated IPS panel, I only want, at least it can reproduces more natural colors than it does now, I also know that even the same phone model don't always have exactly the same screen color reproduction.
From my searches so far, colour management seems to be completely missing in Android.
I'm a photographer and would like this too. I want to use my tablet to review photos, but the colour is way off.
flar2 said:
From my searches so far, colour management seems to be completely missing in Android.
I'm a photographer and would like this too. I want to use my tablet to review photos, but the colour is way off.
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my phone display produces too strong blue and red, less green, it makes most photos look far from natural.
Are u sure that opx is true black amoled??
What if I say you ... that ..It has a backlight ..
Wanna verify?
Important: make sure u have brightness slider to near low levels. This backlight is not seen at high brightness levels.
Download a gallery like quickpic that lets u open a picture in Fullscreen mode so that picture fills entire screen.
Make a bmp image in ms paint in windows and fill it with perfect black. Or download from some website with hex value coding -enter zero for all numbers
Now load this picture in quickpic or any other Fullscreen gallery.
Switch off every light in ur room .make d room jet dark
Wait a few seconds for your eyes to adapt to darkness
U will see the backlight instead of black.
For more easy recognition see in peripheral field of vision, where low light vision is good. (Focus point of eye doesn't have low light vision ,am a doc.) (see somewhere else, bring in the phone into vision filed)
If u think the gallery is d problem.
Do this same thing in any other amoled phone. You will know the meaning of black.
(I did in Moto x ghost )
It's not a backlight. No AMOLED screen uses a backlight. That would defeat the whole purpose of AMOLED.
What happens is, even if the pixels are black (switched off), they are fed a tiny amount of voltage from the motherboard to allow quick switching of colors so they are never completely turned off. As a result, even when displaying black they emit a very faint glow.
I'm not sure if this only happens on pentile displays (like the one in the OPX and most Samsung phones) and I can't verify since the only AMOLED devices I own are pentile, but my Galaxy S3 Neo also has this "problem". Personally I wouldn't worry too much about it, since even with the glow the blacks are WAY deeper than any LCD display with a backlight can produce.
SpaceDye said:
It's not a backlight. No AMOLED screen uses a backlight. That would defeat the whole purpose of AMOLED.
What happens is, even if the pixels are black (switched off), they are fed a tiny amount of voltage from the motherboard to allow quick switching of colors so they are never completely turned off. As a result, even when displaying black they emit a very faint glow.
I'm not sure if this only happens on pentile displays (like the one in the OPX and most Samsung phones) and I can't verify since the only AMOLED devices I own are pentile, but my Galaxy S3 Neo also has this "problem". Personally I wouldn't worry too much about it, since even with the glow the blacks are WAY deeper than any LCD display with a backlight can produce.
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Thank God man.
I thought my phone is fake display.
Ur reply is proof that knowledge helps..
Btw just curious.. what are you?? How do you know this information not available in internet... So nice to see you man.
And regarding ur doubt, whether this happens in non pentile array amoled ...
NO.
I own a RGB amoled -Moto x ghost phone. It doesn't happen there.
I will check in moto x droid turbo . My cousin has it. So I will do and post results here.
And I wish to add this :
A 312 ppi RGB amoled (I have moto x ghost, 720p, 4.7 inch) is way better much much better than 440 ppi pentile amoled ( I have opx, full HD 5inch)
If I compare the images, they are much cleaner and sharper than opx . It's like the image has a depth, there is some stillness kind of feel. ...( I use colour control kcal, and so I test the displays in many settings not just default.
For example to make the images look similar as moto x ghost so that we can compare, I use rgb values as 32, 30, 27 value at 123, contrast at 121 and then slide the brightness slider to 3/4 or more.
Now both images look same in terms of how much dark areas are visible , the white wash noted in opx is now gone.
Now the images are ready for comparision.
Now the difference is the sharpness or clarity in rgb amoled. The feel difference i get is that there is depth in RGB. Its has a grip.