On 1/14/19, Michael Koch <[email protected]> wrote: > Am 14.01.2019 um 08:40 schrieb Michael Koch: >> 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 > > But the output of the overlay filter seems to be RGB24. Is it possible > to get RGB48 out of the overlay filter? Or is there any other filter for > overlaying two RGB48 images?
Try maskedmerge filter with gbrp16 pixel format. _______________________________________________ ffmpeg-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
