Layout Dialler Contacts - Galaxy Ace S5830 General

I wonder if there is the possibility of changing only the dialing screen? Well, during the sunny days the visualization of the numbers is difficult.
poor visibility:
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
great visibility:
I just wanted to change the dialing screen and keep the rest of the theme.
The second option is better on sunny days.
ROM: http://forum.xda-developers.com/showthread.php?t=1583871
Thank you very much

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With a root explorer locate your /system/app folder and copy phone.apk and dialertabactivity.apk to your SD card.
Copy them to your PC and keep a backup of those apps just in case.
Using 7zip or winrar open the apps. Locate their /res/drawable or res/drawable-mdpi folders. Those contain the graphics. Locate the ones with the numbers and extract them.
Edit the graphics with a good software (not paint, something like Photoshop) and save them without changing their size or format.
Drag the edited .png images to the /res/drawable or drawable-mdpi folder of the apps. Don't extract and repackage the whole app, just drag and drop the edited files in their corresponding folders whike using 7zip or winrar to view the app.
Put the edited apps in your SD and then place them in system/app with rw-r-r permissions.
Reboot, they should work OK. If they don't work (give you Fc) something got screwed in the process, try it again. If all fails, restore your original apps (the ones you backed up) to system/app with proper permissions.