On Wed, Jan 18, 2023 at 4:24 PM Leo Izen <leo.i...@gmail.com> wrote: > > Gamma 2.2 and Gamma 2.8 are tagged in the file as 0.45455 and 0.35714, > respectively (i.e. 1/2.2 and 1/2.8). Trying to identify them as 2.2 and > 2.8 instead of these values will cause the transfer function to not > properly be recognized. This patch fixes this.
Agreed upon reading the spec, which notes that the value is saved as an unsigned 24bit integer consisting of the numerator part of a rational number, with a 10^7 denumerator and a valid range of (0, 1]. Only nit: recognization -> recognition > --- > libavcodec/libjxldec.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/libavcodec/libjxldec.c b/libavcodec/libjxldec.c > index 55c7366f61..0009af9615 100644 > --- a/libavcodec/libjxldec.c > +++ b/libavcodec/libjxldec.c > @@ -167,9 +167,9 @@ static enum AVColorTransferCharacteristic > libjxl_get_trc(void *avctx, const JxlC > case JXL_TRANSFER_FUNCTION_DCI: return AVCOL_TRC_SMPTE428; > case JXL_TRANSFER_FUNCTION_HLG: return AVCOL_TRC_ARIB_STD_B67; > case JXL_TRANSFER_FUNCTION_GAMMA: > - if (jxl_color->gamma > 2.199 && jxl_color->gamma < 2.201) > + if (jxl_color->gamma > 0.45355 && jxl_color->gamma < 0.45555) > return AVCOL_TRC_GAMMA22; > - else if (jxl_color->gamma > 2.799 && jxl_color->gamma < 2.801) > + else if (jxl_color->gamma > 0.35614 && jxl_color->gamma < 0.35814) These values leave ~0.001 of leeway which seems like it was before. LGTM _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
