From: Carl Hetherington <cth@carlh.net>
Date: Fri, 12 Aug 2022 14:18:02 +0000 (+0200)
Subject: Put the OpenGL XYZ -> RGB gammas the right way round (#2294).
X-Git-Tag: v2.16.20~3
X-Git-Url: https://git.carlh.net/gitweb/?p=dcpomatic.git;a=commitdiff_plain;h=6f5dfca48413625f734a3a169ff1b0a152ead7b1

Put the OpenGL XYZ -> RGB gammas the right way round (#2294).

1/2.6 is the correction when converting to XYZ, not to RGB.
---

diff --git a/src/wx/gl_video_view.cc b/src/wx/gl_video_view.cc
index 29d44fcd2..284624372 100644
--- a/src/wx/gl_video_view.cc
+++ b/src/wx/gl_video_view.cc
@@ -209,8 +209,8 @@ static constexpr char fragment_source[] =
 "\n"
 "vec4 cubic(float x)\n"
 "\n"
-"#define IN_GAMMA 2.2\n"
-"#define OUT_GAMMA 0.384615385\n"       //  1 /  2.6
+"#define IN_GAMMA 2.6\n"
+"#define OUT_GAMMA 0.454545455\n"       //  1 /  2.2
 "#define DCI_COEFFICIENT 0.91655528\n"  // 48 / 53.37
 "\n"
 "{\n"