POV-Ray : Newsgroups : povray.advanced-users : Gamma issues : Re: Gamma issues Server Time
16 May 2024 13:08:36 EDT (-0400)
  Re: Gamma issues  
From: Warp
Date: 15 Jul 2014 14:19:58
Message: <53c570ce@news.povray.org>
posfan12 <nomail@nomail> wrote:
> However, no matter what I try, if I want to reproduce 3.6 colors in 3.7 I *also*
> have to use the gamma_color_adjust macro described on that page. The wording in
> that article makes it seem like switching from color rgb to color srgb should be
> enough. Can anyone else confirm this? Thanks.

Anything that smoothly transitions from one color/shade to another
(such as in gradients or in the lighting of curved surfaces) will
look different depending on the assumed_gamma, regardless of whether
the specified colors look the same or not. (That's because they will
not look linear with assumed_gamma 1.0.)

Without going into the discussion of how accurate this is to reality,
the only way you can currently achieve the 3.6 results is by using
#version 3.6 or assumed_gamma 2.2.

(Ok, there's a third possibility, but it involves twiddling with the
finish parameters of all objects, and it's complicated.)

-- 
                                                          - Warp


Post a reply to this message

Copyright 2003-2023 Persistence of Vision Raytracer Pty. Ltd.