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

From: Leo Izen <leo.izen@gmail.com>
To: ffmpeg-devel@ffmpeg.org
Cc: Leo Izen <leo.izen@gmail.com>
Subject: [FFmpeg-devel] [PATCH] avcodec/exr: tag gamma=1.0 output as linear light
Date: Wed, 16 Aug 2023 01:20:06 -0400
Message-ID: <20230816052006.53562-1-leo.izen@gmail.com> (raw)

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@gmail.com>
---
 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:
-- 
2.41.0

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