Changing color pict in grey excepted one color

[Gypsie38]

denzjos Wrote:If you just want to view one colour, then you can use Tintii (also as plugin in gimp) https://indii.org/software/tintii/

I thank you. I did use it many years ago but stopped it because I had a message that my trying period was over.

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Thank you to everyone. But, for me, it seems complex!. Anyway, I'll try, following this tuto