[HACK] Calibration profile for Nexus One v5.1, now with 100% less Sith! - Nexus One Android Development

One of the most common criticisms of the Nexus One is its screen. Beyond a few touchscreen problems, a lot of people have had problems with the screen being too blue. This mod attempts to correct this color cast.
The top is with my hack, the bottom is without. This is a color accurate version. The weird green band is just the combination of my camera and what is on the page.
Here is a screenshot of the .apk:
UI, on Flickr
Currently, the color cast is corrected for most people's taste and there is an app to configure it.
Beyond color casts, it is theoretically possible to fix the gamma. It is currently 1.5 when it should be 2.2. That is a fairly bad setting. The roadblock to the implementation of this is that SurfaceFlinger, the window control application in Android, would have to be converted to OpenGL ES 2.0, which some devices don't support, and I would have to figure out how to write the right shader. If you or someone you know is experienced in GLSL for mobile devices, let me know.
Installation:
Anything earlier than Froyo is not supported. If you really want me to add support, let me know, but I'm not putting the time in unless there is a strong need.
For CM6 Nightlies (after Aug 8th) or CM6 final you don't need to flash anything, just install the CM .apk.
For most other roms, you want Universal .zip and normal .apk.
If universal doesn't work due to a failure to flash (so far, this is confirmed for eVIL's Sense V1.00 rom, but not later versions), try the one labeled Sense.
After you install the .zip and there are no errors during flashing, then install the Calibrator Control app.
Use:
To control it, open the Calibration Settings app and just change the numbers. Let me know what numbers you find pleasing to your eye. We currently use: Red = 975, Green = 937, Blue = 854 for the settings for reference. It will save your settings and load them on boot. This feature only works if you have the app installed on the phone and not on the SD card.
As always, there is no warranty with regards to this hack.
Credit goes to Cyanogen and his team for maintaining the source I based my small tweak off of and the authors of the original source, RixKliq for the great icon, and xenio2000 for the UI improvements and help with presets.
Changelog:
V1.0 - First hacky implementation
V2.0 - Cleaned up implementation, integrated better
V2.0b - Fixed signing issues.
V3.0 - Added 3 presets, of which the neutral one loads at boot.
V3.1 - Moved presets slightly cooler, added low red mode for low brightness screens and those who hate red.
V3.2 - Changed profile to be significantly more accurate and fixed multilingual bug.
V4.0 - API not changed, but new .apk allows on boot loading of any color setting you want.
V4.1 - API changed, but only to add a wider rom support. It still requires froyo though.
V4.2 - API not changed, added support for roms that moved libraries to /data/lib, enhanced UI.
V5.0 - API not changed, sadly, but added presets, major UI overhaul to .apk.
V5.1 - Bugfixes galore!
(Still) Planned:
Adding gamma, much less likely than I thought.
Adding dynamic red decrease as the backlight goes down.
Downloads
V5.1 is an .apk fix only, so no need to get the .zip file.
Universal (AOSP) Download:
http://dl.dropbox.com/u/9780975/calibrated-signed-42-Universal.zip
Sense (Desire) Download:
http://dl.dropbox.com/u/9780975/calibrated-signed-42-Sense.zip
Calibrator Controller V5.1 Normal Download:
http://dl.dropbox.com/u/9780975/Calibrator-5.1-Universal.apk
Calibrator Controller V5.1 CM Nightly (and Final) Download:
http://dl.dropbox.com/u/9780975/Calibrator-5.1-CM6.apk
Known Bugs
If calibration is enabled, Spare Parts will crash when Render Settings is opened.
Some versions may have logcat spam. Let me know if this happens to you.

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Is there any way to test this feature without CM6?

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Any risk of damaging the display? Sorry, had to ask
I am willing to give it a try.

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stuff said:
Is there any way to test this feature without CM6?
Click to expand...
Click to collapse
It's possible, I just put CM6 as that is what I had on my phone to test it with and that is what source I built it from. Any rom that allows you to change the render effect should be compatible but really, all I can do is upload the code and see who would want to implement it in their rom.
jblparisi said:
Any risk of damaging the display? Sorry, had to ask
I am willing to give it a try.
Click to expand...
Click to collapse
It shouldn't be a problem, it runs the blue OLEDs at a lower brightness, so it shouldn't go out of spec. In fact, it should increase the display life, but these are all "should"s.

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Cool. My rom doesn't allow the rendering effect, unfortunately. I want to try this

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stuff said:
Cool. My rom doesn't allow the rendering effect, unfortunately. I want to try this
Click to expand...
Click to collapse
I think like me your forgetting you can do a full nandroid + ext, wipe, install cm6, install mod, play around a bit, nandroid + ext, wipe, restore in about 20-30 mins

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dogiedogie said:
I think like me your forgetting you can do a full nandroid + ext, wipe, install cm6, install mod, play around a bit, nandroid + ext, wipe, restore in about 20-30 mins
Click to expand...
Click to collapse
yeah i know. but I just have all my settings exactly as I like. in fact, my phone almost feels completely tuned in terms of performance. i just know any rom that I flash, I won't like as much as the one I have.
Plus I'm just waiting for CM6 final.

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nice. I've thought it was way too cool since I powered it on the 1st time.
I'll give this a go in a bit.
thx for sharing.

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Once you get all this fixed up, send me a pull request on github and I'll merge it into CM

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I'd love to try this myself, but I won't have access to my Android SDK computer until this weekend.
I'm curious, would you happen to have any comparison pictures?

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EarthsiegeTA said:
I'm curious, would you happen to have any comparison pictures?
Click to expand...
Click to collapse
(10 characters)

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There you go, see the OP, it looks a bit too yellow in the pic, but it does show the difference.
Edit: Fixed the colors to show it exactly as it appears on the phone on my calibrated screen.

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*rimshot*
Very cool.

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as I was saying in the other thread, will it be possible to correct this bad effect??
{
"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"
}
and make it decent, like iphone...
your doing a great job, i'm gonna try those new settings

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I'm not sure I can, as the gallery app is closed source. Maybe I can try webkit for the browser, but I wouldn't know where to start.
In other news, I'm working on making a more elegant solution. I may have something worthy of adding to CM by late this evening.

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I THOUGHT that colour banding problem was fixed in an update some time, because I remember the original article had an 'UPDATE:'.

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wow keep up to good work...you shuld put your "donate" button somewhere
EDIT: i tried the new calibration, the only thing that i don't like is that white, isn't pure white anymore...it's a bit yellow, like old paper...is it intended to be like that?? I mean, that's the correct value for white?
EDIT2: google said that they would have implemented new 24bit Gallery in 2.2...but images in 2.2 Gallery still looking bad, and they look bad in astro too!! The browser is the only one that displays beautiful images without banding...i've just tried with the "sunset on mars" image
http://www.displaymate.com/NASA_Sunset_on_Mars_1080.jpg

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Something's up with the link. I can't download this file even though other files on Mediafire are working for me.

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elmerendeiro said:
wow keep up to good work...you shuld put your "donate" button somewhere
EDIT: i tried the new calibration, the only thing that i don't like is that white, isn't pure white anymore...it's a bit yellow, like old paper...is it intended to be like that?? I mean, that's the correct value for white?
Click to expand...
Click to collapse
Well, there's two calculations for color, there's the normal one and the planck-calculated one. For this driver, the color is 6500 on the normal one but 6000 on the planck one. It also gets yellower the brighter the screen is. So, since I figured out how to do an update.zip, my next update in an hour or so will have the brighter value with planck calculated values.
However, it took me a month to get used to how "yellow" my computer was once I calibrated it.
Lastly, bad news, I don't think I can change the gamma. I can't individually address the pixels to mess with them except in the kernel. That would be a mess.
Oh, I'll have a better version up in 10 minutes or so, so there'll be a new link.

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Check my 2nd edit...
Im gonna try the new file tomorrow since it's sleep time here..
For the gamma setting maybe we should contact some kernel master...good night!
Sent from my Nexus One using XDA App