Am 14.01.2019 um 07:28 schrieb Michael Koch:
When I create a color-look-up-table with this command line, the result
is a 512x512 clut saved as 16-bit PNG. It works as expected and I
checked that the top left pixel is black (R=0, G=0, B=0) and the
bottom right pixel is white (R=65026, G=65026, B=65026).
c:\ffmpeg\ffmpeg -f lavfi -i haldclutsrc=8 -frames 1 -pix_fmt rgb48be
-y clut.png
In the next example I wanted to extract one frame from a video,
overlay the clut in the top left corner, and save it as 16-bit PNG. I
need 16-bit PNG because my video is 10-bit. At first glimpse the
result looks good, but a closer examination finds that the top left
pixel is not pure black, it's R=0, G=1285, B=0, and the bottom right
pixel of the clut (at coordinates 511,511) is not pure white, it's
R=65535, G=63736, B=65535. Why are the colors wrong?
c:\ffmpeg\ffmpeg -ss 5 -i P1000099.mov -f lavfi -i haldclutsrc=8
-filter_complex overlay -frames 1 -pix_fmt rgb48be -y Image_with_CLUT.png
I found a solution myself: overlay=format=rgb
Michael
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