Am 21.04.2022 um 04:25 schrieb Roger:
...
You can make your own LUT, as described in chapter 2.28 in my book.
-- Extract one frame from your video.
-- Insert a haldclut in a corner of the image, or use xstack to attach it to
the side.
-- Use the program of your choice to correct the colors in this image. When
done, save it lossless as 16-bit PNG.
-- Use FFmpeg to separate the haldclut from the image.
-- Apply the LUT to the whole video.
Michael
Sorry. I had a little difficulty with understanding the text within the
Chapter 2.28. Just couldn't scan and understand easily. Although I thoroughly
understand SH/Bash, the variable assignments for simple filenames also slowed
reading, as I had to scan/reference back to the top of the page for the
definition/intent of the variable used. Easier understanding for the reader to
read, "input_video.ext" and "output_video.ext", or use a similar named variable
such as $_input_video.ext and $_output_video.ext. Note: using a prefixed
underscore within SH/Bash variables separates/isolates from any possible
conflicts. Heard of using this syntax from the Bash mailing list when doing C
style defines in SH/Bash. However, for the sake of easy readability for
readers, it's probably best to use simple non-isolated variables.
My examples are for Windows batch files. For example, the line
set "IN=P100.mov"
sets the variable IN to the value P100.mov
If this variable is used in the command line, for example
ffmpeg -i %IN% -vf crop=...
then %IN% will be replaced by the filename, so that the command line for
ffmpeg becomes
ffmpeg -i P100.mov -vf crop=...
Michael
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