[FFmpeg-trac] #3801(undetermined:closed): SWSCALE: Incorrect Values in Full Range Conversion RGB to YCbCr
FFmpeg
trac at avcodec.org
Fri Jul 25 02:17:39 CEST 2014
#3801: SWSCALE: Incorrect Values in Full Range Conversion RGB to YCbCr
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Reporter: troy_s | Owner:
Type: defect | Status: closed
Priority: normal | Component:
Version: unspecified | undetermined
Keywords: range | Resolution: invalid
Blocking: | Blocked By:
Analyzed by developer: 0 | Reproduced by developer: 0
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Changes (by michael):
* status: new => closed
* resolution: => invalid
Comment:
The 2 png images are nearly identical, i see some +-1 differences from
different rounding, which is clearly not what was meant in this bug,
though if our rounding is suboptimal then such suboptmal rounding of
course would be a bug that iam interrested in.
The big vissible color difference is a fault in how the file was created,
one of the pngs has a gamma of 1.0 the other does not. firefox displays
them quite differently, other software shows them nearly identical,
ignoring gamma i assume
xview, displays this difference:
ARIB_STD-B28_YCbCr_full.png is 1920x1080 PNG image, color type RGB, 8 bit
test-full-444-out.png is 1920x1080 PNG image, color type RGB, 8 bit, file
gamma 1.0000
Also the difference png shows massive differences in areas that are bit
exactly identical
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Ticket URL: <https://trac.ffmpeg.org/ticket/3801#comment:2>
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