[FFmpeg-cvslog] avcodec/exr: tag gamma=1.0 output as linear light

[Leo Izen]

ffmpeg | branch: master | Leo Izen <leo.izen at gmail.com> | Wed Aug 16 00:54:36 2023 -0400| [7098bec73bd3de63f514ba6ec091fd2f5096ddce] | committer: Leo Izen

avcodec/exr: tag gamma=1.0 output as linear light

By default the OpenEXR decoder outputs linear light pixel data by
applying a gamma=1.0 transfer (i.e. a no-op). When it does so, it
should tag the data as linear so color-managed filters or other tools
can work with it correctly.

Signed-off-by: Leo Izen <leo.izen at gmail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=7098bec73bd3de63f514ba6ec091fd2f5096ddce
---

 libavcodec/exr.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavcodec/exr.c b/libavcodec/exr.c
index fae1d08ab0..518066facf 100644
--- a/libavcodec/exr.c
+++ b/libavcodec/exr.c
@@ -2088,6 +2088,8 @@ static int decode_frame(AVCodecContext *avctx, AVFrame *picture,
 
     if (s->apply_trc_type != AVCOL_TRC_UNSPECIFIED)
         avctx->color_trc = s->apply_trc_type;
+    else if (s->gamma > 0.9999f && s->gamma < 1.0001f)
+        avctx->color_trc = AVCOL_TRC_LINEAR;
 
     switch (s->compression) {
     case EXR_RAW: