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Ramiro Polla 4bee010844 swscale/range_convert: fix truncation bias in range conversion

384fe39623 introduced a regression in the
range conversion offset calculation, resulting in a slight green tint
in full-range RGB to YUV conversions of grayscale values.

The offset being calculated was not taking into consideration a bias
needed for correctly rounding the result from the multiplication stage,
leading to a truncated value.

Fixes issue #11646.

2025-11-06 20:36:08 +00:00

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 fde3250911dbb7f1a5ed7cd385d92b2f *tests/data/fate/vsynth_lena-mjpeg-422.avi
 tests/data/fate/vsynth_lena-mjpeg-422.avi
 bc3811ab5fdb33cef828465d3d056903 *tests/data/fate/vsynth_lena-mjpeg-422.out.rawvideo
 stddev:    4.18 PSNR: 35.70 MAXDIFF:   49 bytes:  7603200/  7603200