Le 2021-05-28 à 14:34, MichaelJF a écrit :
> Am 27.05.2021 um 17:04 schrieb Thomas de Groot:
>> Want to play with complementary colours? in rgb or srgb mode? Try 
>> this. Nothing special, just messing around for a change, away from 
>> granites...
>>
> I admit that I did not followed the granite discussion (too much 
> entries). But red and blue are not complementary to each other in any 
> colour modell I knew. Blue is complementary to some shade of yellow and 
> red to some shade of green. There is a colour modell which takes red and 
> cyan and blue and orange as complementary, but I could not find red and 
> blue.
> 
> Best regards
> Michael
Red, green and blue are the additive primaries, or RGB. Their usual 
complement are the subtractive primaries : Magenta for green, yellow for 
blue and cyan for red, or YCM.

This can obviously change if you use some other colour space.

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