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.
Hi all,
I have a feeling that my Vibrant's colors are over saturated.
Is there any way of modifying the color settings to make them less saturated?\
Thanks
I think theyre not. Theyre just they way theyre supposed to be
Yes, Galaxy S colors are oversaturated by default.
I address this with current Voodoo color patches, restoring the saturation to its normal state.
supercurio said:
Yes, Galaxy S colors are oversaturated by default.
I address this with current Voodoo color patches, restoring the saturation to its normal state.
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So what, you're washing the screen out now? Awesome! I guess the next step is replacing it with a regular LCD so we can also miss out on those viewing angles and black levels.
The images you're looking at are probably oversaturated or have color distortion.
Yeah, they are definitely over saturated but I think its better like that. I would say that the iphone has a very good balance between normal and oversaturated colors but it just depends on choice.
I am a digital photographer by trade. I use pantone monitor calibration to get that perfect look then biuld printer profiles so what I see is what I print.
I ran the sensor on my vibrant it its up on all the primaries by 2-3 points. Many cameras add this, especially the point n shoots. We live in a high def oversaturated world. On the Vibrant to me this looks like an unscientific adjustment to fit the times. I can just see the Samsung tech guys with sliders and executives saying, "thats good, right there ". Yikes.
They did the same with the head phone output being inhanced and not transparent.
Not sure they thought they would run into us tech heads.
In all honesty it doesn't bother me a bit. I leave it as is.
Sent from my SGH-T959 using XDA App
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.
I've noticed that when I watch youtube videos the people's skin looks a little bit yellowish and in general I don't like in general that the yellow seems a little bit off .How do you have your own color balance?
There is no best when it comes to colors, you can change the colors in the display setting to what ever you like.
shafez said:
There is no best when it comes to colors, you can change the colors in the display setting to what ever you like.
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Yeah skins color looks better with amoled photo mode too bad reds are a little bit washed out there
I just set it to Adaptive Display.