Changes between Version 41 and Version 42 of colorspace

Timestamp:

Oct 21, 2024, 3:28:32 AM (22 months ago)

Author:

MasterQuestionable

Comment:

# ͏"full_chroma_in*" related

colorspace

@@ -367 +367 @@
 https://github.com/MasterInQuestion/attach/raw/main/@ext/trac.ffmpeg.org/wiki/colorspace/colorspace_yuv444p10le-yuv420p.webp
 
-=== Hint about "[https://ffmpeg.org/ffmpeg-scaler.html#Scaler-Options full_chroma_inp]"[=#Hintaboutfull_chroma_inp] === #full_chroma_inp
-
+=== "full_chroma_in*" related[[span(id=full_chroma_in*)]] === #full_chroma
+
+[ haasn @ CE 2024-08-16 09:43:37 UTC:\\
+https://github.com/FFmpeg/FFmpeg/commit/3e064f52eb368a373ded6e3704fcf29f1db3ff12
+
+[ "SWS_FULL_CHR_H_INT"\\
+͏    Perform full chroma upsampling when upscaling to RGB.
+
+͏    For example, when converting 50x50 yuv420p to 100x100 rgba:\\
+͏    Setting this flag will scale the chroma plane from 25x25 to 100x100 (4:4:4):\\
+͏    And then convert the 100x100 yuv444p image to rgba in the final output step.\\
+͏    .\\
+͏    Without this flag, the chroma plane is instead scaled to 50x100 (4:2:2):\\
+͏    With a single chroma sample being re-used, for both of the horizontally adjacent RGBA output pixels. ]
+
+[ "SWS_FULL_CHR_H_INP"\\
+͏    Perform full chroma interpolation when downscaling RGB sources.
+
+͏    For example, when converting a 100x100 rgba source to 50x50 yuv444p:\\
+͏    Setting this flag will generate a 100x100 (4:4:4) chroma plane, which is then downscaled to the required 50x50.\\
+͏    .\\
+͏    Without this flag, the chroma plane is instead generated at 50x100 (dropping every other pixel):\\
+͏    Before then being downscaled to the required 50x50 resolution. ] ]
+
+͏----
+
+[ MasterQuestionable:\\
+͏    The description is much misleading... if not outright misinformation?\\
+͏    |1| Both may be RGB irrelevant: occurs during YUV unsubsampling.\\
+͏    |2| SWS_FULL_CHR_H_INT may involve down-scaling too.\\
+͏    |3| [\\
+͏    SWS_FULL_CHR_H_INP asserts full-chroma input; which then forces use of full-chroma interpolation: whether sensible or not.\\
+͏    Which is actually somewhat useless: as the default handling seems... sensible? ]
+
+͏    Hint about [[span( id=full_chroma_inp, [https://ffmpeg.org/ffmpeg-scaler.html#Scaler-Options ͏"full_chroma_inp"] )]]:\\
 ͏    https://github.com/search?type=code&q=repo:FFmpeg/FFmpeg+%22SWS_FULL_CHR_H_INP%22\\
-͏    https://github.com/FFmpeg/FFmpeg/blob/4ec45aca36ff6c7c7767536ce7f4a855f8b37fb0/libswscale/utils.c#L1530-L1546\\
+͏    https://github.com/FFmpeg/FFmpeg/blob/08c632ec0f0c36affd2edad2e0add6e046d6c8be/libswscale/utils.c#L1540-L1556\\
 ͏    https://github.com/FFmpeg/FFmpeg/blob/41ed7ab45fc693f7d7fc35664c0233f4c32d69bb/doc/swscale.txt#L50-L57
+
+͏    On "full_chroma_int":\\
+͏    https://github.com/MasterInQuestion/attach/commit/e18e5cd26b9d27bacefa685ba70d0d41bc7d7cbc#diff-75a0130f1814ba26c23e3a6fc6ce5046620163061d392086bc55e2c13c145bf9L264 ]