May I ask what kind of changes were made in ArgyllCMS 1.7.0 beta since the latest official release version 1.6.4? It performs most admirably. I have created several monitor and HDTV 1DLUT's with almost no grayscale gradient banding, a definite improvement over previous 1.6.4 or maybe I was just lucky with the latest LUT's and experienced a placebo effect..?
EDIT: I also have some trouble creating a power-law gamma @ 2.2 (PLG22) 1DLUT with ArgyllCMS 1.6.4 x86 and 1.7.0 x86 beta. The resulting LUT fully clips / crushes the first black level 1 (0-255 scale), even though my MVA monitor has rather deep blacks and 4300:1 static native contrast ratio. It is quite strange than IPS and even some TN monitors with very low CR of 1000:1 & below can handle a straight-line PLG22 curve from 10-100% IRE without any clipped black levels, while mine can't...
I know PLG22 is technically incorrect, but it does make sense to use it. The argument for BT.1886 usage for films is sound because films are mastered on TV's with excellent black levels, unlike most consumer TV's, and we don't even know which exact gamma is used to master those films, leaving BT.1886 as the best choice. Unlike film mastering displays, displays used for game development are mostly IPS monitors with poor blacks, 1000:1 contrast ratio, and PLG22 / sRGB gamma. Consumer monitors used to play games have about the same black levels and poor contrast, which means they would need to be calibrated to PLG22 instead of BT.1886 to view game content the way it was "mastered" / developed. Those monitors with lower sub-800:1 CR and even poorer blacks do need BT.1886 or else their black levels will be clipped.
Last edited by Masharak; 01-04-2015 at 05:20 AM.