[Nexus 4 General] DirkBelig:
I've spent a couple hours messing with the settings from the spreadsheet and while some are an improvement, they still don't strike me as being a match for my color-calibrated Dell UltraSharp U2410 and to a lesser extent my calibrated MacBook Pro, which has a cooler color temperature.

I'm not going to post the link to my reference image/wallpaper because it's NSFW, but if you do a Google image search for Jana Potysova with Safe Search off it's the first hit (the one on the couch) which good to use because the neutral cream color of the fabric really shows color casts and skin lit with diffuse light sources provides a lot of subtle variations in tone and complexion. Grass and sky and apples can be all sorts of shades making it hard to use to judge color, but we see skin everywhere and have a sense of what's "correct." That's why getting accurate skin tones is so desired in color calibrating everything from HDTVs to printers. It's also a hot photo IMO.

If you look at it on a corrected display, three things stand out - OH, GROW UP!!! - first being the even warm tone of the fabric and how the light falls off from right to left moving away from the light source, probably a large rectangular softbox. (I'm a photographer and am always trying to guess the lighting setups.) Second is the warm skin tone with slight pinkish highlights in the face. Lastly is how the highlighted areas of her thigh and breast - QUIT SNICKERING, CHILDREN, OR I'M TURNING AROUND!!! - are light but not blown out; there is still color on those areas.

On my Galaxy S II Epic 4G Touch Long Name Phone, this image looks very close to my Dell display, just a little darker in overall brightness, and comparable to the MBP, though that's generally cooler and has a bit of magenta bias to the image. But on the N4, the lightest areas of the fabric are nearly blown out, making the light appear harsher; the area at far left that she's resting her head on looks white. Using the settings I list below, her skin looks better than the either N4 I have looked, but it's not as warm and pink-looking; she seems slightly grayish. In the highlight areas, the skin gets very blotchy and yellowish. If I didn't have the calibrated computer displays to compare to, I'd presume the photo as seen on the phone was overexposed, but since a reference is available, I can see the issue is the phone's rendering. FauxClock definitely helps, but it's not a panacea with any of the settings posted so far.

Here is what Display Tester shows as being the gamma points - once it get done FCing 80% of the time I tried to use the gamma patterns - for the stock LG settings and Undercover's settings:

Stock LG Presets:

255/255/255 0/0/0 0/0/0

Gray2.0 R1.6 G1.8 B1.6 Y1.8 C1.8 M1.8

Undercover's settings:

255/255/255 20/19/19 0/0/0

Gray2.6 R2.2 G2.2 B2.2 Y2.4 C2.4 M2.1

The points I'm seeing match what he put in the spreadsheet other than gray which he just said was way off, which it is. Checking other photos that I've taken show that blotchy skin is endemic to the Nexus 4, the only difference between my two N4s is that the 1st (launch day order, rev_10 hardware) has a bluish tone to it in its uncorrected state and the 2nd (replacement for first which had a muffled microphone, rev_11 HW) was very obviously yellowish out of the box and while it's possible to spend extra money to get an app to kick the gamma around into something almost acceptable, it's still disappointing for what was supposed to be a really good screen.

Undercover's settings are the closest to ideal that I've tried, but how to get it home, or is it even possible with this phone?

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AFAIK, as long as you don't remove anything from the stock image, OTAs will work, but at the cost of root; you'll have to either re-root or use Voodoo OTA RootKeeper to fix that up after an OTA. Where OTAs fail is when components have been removed, thus the new image doesn't match.

---------- Post added at 06:30 PM ---------- Previous post was at 06:21 PM ----------

Compared to Undercover's settings discussed above, these help tame the skin blotchiness in highlights and the blown out fabric, but Jana overall looks grayer, less ruddy and healthy.

Looking at my MBP, I think it's due for a recalibration. [/goes for Eye-One Match sensor]