Hey all, I've had a chance to look more at the problem of display gamma recently. It seems there is quite a lot of misinformation out there, and very little in the way of standards that are actually applicable to the technology we have now. Theory is diverging from practise in a number of areas, for instance we calibrate to gamma 2.4 to adapt for viewing conditions in Linux, and people are calibrating to gamma 2.2 in Windows when using the X-Rite tools.
I'm wondering about the basics of what gamma is and also how to measure it. Some of the questions I'm asking myself: * on real life hardware, can we assume gamma_red == gamma_blue == gamma_green? * how do we measure gamma given there's an offset at zero for anything other than LED displays - pretending the backlight is zero and offsetting everything to that seems a giant hack given our perception of light isn't linear. * roughly how many points does it take to calculate the gamma assuming the hardware is well behaved (e.g. monotonic) -- three seems the obvious answer, but the backlight at 0,0,0 and measurement accuracy makes that tricky. * how does the 2.4 v.s. 2.2 gamma adaption for viewing conditions work? Is that a function of the luminance of the room, in which case we should probably measure ambient first and do something more technical than += 0.2. I can't find much up-to-date technical literature on display gamma (anything written in the last 5 years) so if anybody can point me at anything in Amazon or a research journal that a human being could understand I'd appreciate it. Thanks, Richard. ------------------------------------------------------------------------------ Master HTML5, CSS3, ASP.NET, MVC, AJAX, Knockout.js, Web API and much more. Get web development skills now with LearnDevNow - 350+ hours of step-by-step video tutorials by Microsoft MVPs and experts. SALE $99.99 this month only -- learn more at: http://p.sf.net/sfu/learnmore_122812 _______________________________________________ Lcms-user mailing list Lcms-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lcms-user
