[FFmpeg-user] Colorchart and colormap

Michael Koch astroelectronic at t-online.de
Tue Apr 26 11:05:07 EEST 2022

Am 26.04.2022 um 09:18 schrieb Paul B Mahol:
> On Tue, Apr 26, 2022 at 8:39 AM Michael Koch <astroelectronic at t-online.de>
> wrote:
>> 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.

But somehow the filter must internally have detected that mapping isn't 
possible if two source colors are identical. Because the output is an 
exact copy of the input. This case should trigger a warning or error in 
the console output.


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