Hi people,
as the question came up, I did some tests with the current CVS version
of the denoiser to check if it might cause green offsets (like it did a
long time ago)... Here is what I did (if you want to check yourself, no
problem, I can send you the gray.ppm I used...)
1. Test:
feeding a 20 shades of plain gray image (ppm, 0-100% colorbars)
through this commandline: "cat gray.ppm|ppmtoy4m -F 25:1 -n 1500
-r -S 420mpeg2|yuvdenoise -M24,24,24 | mplayer - -vo tga" and then
analysing frame 750 (let everything stabelize...)
Result: OK, all levels remain neutral, no green, not by a bit...
2. Test:
feeding a 20 shades of plain gray image (ppm, 0-100% gray) through
this commandline: "cat gray.ppm|ppmtoy4m -F 25:1 -n 1500 -r -S
420mpeg2|yuvdenoise -m24,24,24 | mplayer - -vo tga" and then
analysing frame 750
Result: OK, same as test 1...
3. Test:
feeding a 20 shades of plain gray image (ppm, 0-100% gray) through
this commandline: "cat gray.ppm|ppmtoy4m -F 25:1 -n 1500 -r -S
420mpeg2|yuvdenoise -t24,24,24 | mplayer - -vo tga" and then
analysing frame 750
Result: OK, same as test 1+2...
4. Test:
feeding a 20 shades of plain gray image (ppm, 0-100% gray) through
this commandline: "cat gray.ppm|ppmtoy4m -F 25:1 -n 1500 -r -S
420mpeg2|yuvdenoise -m 24,24,24 -t24,24,24 -M24,24,24| mplayer -
-vo tga" and then analysing frame 750
Result: OK, same as test 1+2+3...
Overall result: In these tests, there have been no green tints resulting
from rounding errors in the denoiser. To make things complete, I will
check the other tools in Nicolas' commandline, too...
cu
Stefan
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