[FFmpeg-user] Colorchart and colormap

Paul B Mahol onemda at gmail.com
Tue Apr 26 10:18:16 EEST 2022

On Tue, Apr 26, 2022 at 8:39 AM Michael Koch <astroelectronic at t-online.de>

> Am 25.04.2022 um 22:19 schrieb Paul B Mahol:
> > On Mon, Apr 25, 2022 at 10:06 PM Carl Zwanzig <cpz at tuunq.com> wrote:
> >
> >> On 4/25/2022 12:49 PM, Michael Koch wrote:
> >>
> >>> Am 25.04.2022 um 21:41 schrieb Paul B Mahol:
> >>>> There is separate software for processing real world colorcharts.
> >>> If colormap isn't for processing of real world colorcharts, then what
> >> else
> >>> is its purpose?
> > Purpose is processing of processed real world colorcharts, not raw ones
> > straight from your photos.
> I did make a test where two of the 24 colors in the "source" image are
> identical. It's impossible to map one color to two different target
> colors. Shouldn't colormap throw an error message? Instead it quietly
> copies the input to the output.

It would be very slow to check if each source color is identical.

> Is it possible to print the RMS error (before and after mapping) to the
> console output?

You can see any error when setting first video stream to have source colors
or better just source colorchart,
than you will see what target colors are, it should be identical to target
colorchart stream.

The more important thing is what happens with midcolors. And that depends
on colorspace/kernel used.

> Michael
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