[AT&T Samsung Galaxy S 4 General] Slade8525:
its about 97% accurate to sRGB (which is industry standard) in Movie mode, versus 91% on iPhone 5, 83% on S4 Active, and 85% on HTC One. The AMOLED screen actually has a wider gamut than sRGB but it is not calibrated correctly. At its most vivid, it is capable of about 102% sRGB gamut, though it does suffer from some slight gamma issues as well due to AMOLED being totally off when displaying 'true' blacks.

I tested them all with a friend and his colorimetry gear with some standard calibration images, with Pantone, sRGB, and Rec709 standard materials as well as gray plates and focusing scales (attached). Feel free to compare to your HDTV/monitor of choice.

However, a 3% variation is negligible at best; most males (60-something percent) are partially colorblind anyways and really cant see the difference until its about 18% off. Women its closer to 1% have color issues, and with females comprising the majority of the population and about 1/3 of the S4 buyers, that means that roughly 75% of you could not tell the difference between a perfectly calibrates S4 and one that is 3%, 5%, or even 10% off.

That said, i have some 10 bit Marshall, JVC, and Sony calibrated field monitors that are closer to 78% sRGB, and i used them every day for work (we use scopes to verify anyways; cant trust your eyes), and even a VERY VERY nice, VERY expensive calibrated 10 bit IPS LED LCD field monitor that costs as much as some new cars that is only 94% accurate.

I rely on my eyes at work every day; i have incredibly sharp and perceptive vision, and i can comfortably say that 'Movie' mode is BETTER than most other screens you would watch movies/tv on, yes including your $1,000 HDTV or $300 PC monitor. I can easily see the pixels on the smaller, 720P GS3 screen, and make them out decently on the S4 as well, even 18" away from my face. The HTC one as well, but its closer to 14" away maximum. That is incredible for me.

TFT has bad viewing angles, very bad backlight passthrough transmission, and is based on old tech. IPS LED would have been a MUCH better choice, but Samsung doesnt do much in that field; TFT they have the tech and fab for. It was a poor choice IMO.

The HTC One screen or iPhone 5 screen is way better than that of the Active for viewing angles, and also much more saturated (One is oversaturated, iPhone 5 only slightly). But for contrast and viewing angles alone, Samsung SHOULD have gone IPS.

KEEP IN MIND...

Brightness, viewing angles, saturation, gamut, and contrast are quantifiable. These are what i base my statements on; what ive measured and what ive seen.

PERCEIVED color is not; thats your brain, mostly. Your eyes only collect raw data. I could show you correctly calibrated images under different lighting and you would swear the peoples faces were purple, green, etc, when in fact they are absolutely correct, and its your brain compensating.

As far as the S4A camera, i had read Samsung had a problem with supply on the 13MP units, and opted for the same part as the S III camera as it was available, and part numbers stack up (pinouts do not). The software camera app on the S4A may not be up to snuff in that case; the S III takes great shots for a camera phone; and if you look at S III, S4A, and S4 shots side by side with the same settings of the same objects under same lighting and other conditions, the S4A and S III are pretty damn close to identical if you check out scopes or histograms; the S4 with the 13MP camera has a slight edge.

I cant see the Perseus kernel doing much better; most of the issue with the S4 screen is gamma shift based off the PenTile display architecture; yes the S4 screen is RGBG, which is an RGB variant, but in practice calibrating it is WILDLY different from an RGB screen. If anyone gets a chance, take a look at the exact same picture (both the one i attached and also one of people) on a Motorola Atrix 4G with the RGBW (red green blue white) pixel layout; the Atrix has THE WORST COLORS I HAVE EVER SEEN, period. BUT, you could see that thing perfectly in the glare of the sun at any angle.