>>254507 No easy answer. Almost any software (including Ai) will give you the wrong answer by default. Most software will give you a very wrong answer (e.g. sRGB averaging or GIMPs "lightness"), other software will give you a less wrong answer (using ITU-BT REC. 709), but in the end it doesn't mean the colors will actually come out equiluminous from your printer.
You can compute it if you have the color-profile of the printer.
>>254702 there is almost no way to obtain a color-profile other than to measure it yourself with a colorimeter. Some (but this is pretty rare) manufacturers give color-profiles for their printers, but those are also only really accurate if you use the type of paper they've been created with.
Once you have it, you can create a document with that colorprofile in krita or sth and probably go from there, IDK, the steps aren't quite clear to me right now, but there's probs a way.
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