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2.1.137 docs: docs/recording.md

John Lauer ·8807893d68 ·1mo ago ·parent c4afeec
1 file changed +4
docs/recording.md+4
@@ -221,6 +221,10 @@ captured about 55 real frames per second. If your Markdown viewer does not play inline video, the four files are on this
 page under `docs/recording/`.
 
+## Colour: why an H.265 take used to look oversaturated
+
+Screen content is RGB; video is YCbCr with a *range* (studio 16-235 or full 0-255) and a *matrix* (BT.709 for HD). Until 2.1.130 the H.265 path wrote full-range pixels and tagged both codecs as full range with no matrix, and players (which treat HD HEVC as studio range whatever the tag says) stretched those pixels a second time: crushed blacks, colours 25-30% too wide. Since 2.1.131 both codecs emit and tag studio range with BT.709 matrix, primaries and transfer, which is the one combination every player renders the same way. Measured against a window of known colours, both H.264 and H.265 takes now come back exact. It was never an "H.265 thing"; it was the tag.
+
 ## Examples
 
 ```bash