Color probing don't give a correct color

[MarcinZone]

Hi,

When i probe the color, I don't get the color i was after. See example:

The color I want re use - 

The color i get instead when i probe - 

They look almost identically but they are not and the funniest thing that happens is that when i write by hand with numbers the color i want i still doesn't work. What is happening. The document settings are CMYK - US Web Coated (SWOP) v2.

 

 

[walt.farrell]

Welcome to the Serif Affinity forums.

Sorry, but I'm not sure what you mean by "probing". Can you describe what you're doing in more detail? For example, what tool you're using, how you're using it. Possibly a screenshot with more context than the color panel (such as the complete application window), and perhaps a sample .afdesign document?

Edit: Also, please note the "Read me first" at the top of this bugs forum, and consider providing more of the required information.

[MarcinZone]

I mean this tool 

[walt.farrell]

Thanks.

But still, for example, what are you sampling from?

We really need more context (full screenshot), sample document, additional system details, etc.

[Paul Mc]

I'm guessing here but it is possible that first HSL value is out-of-gamut for a CMYK document and so it might be that the hue is being ignored which would make the two colours equivalent (in CMYK colour space).

Note that both colours are (11,8,8,0) in CMYK. Once you get into greys then the hues can "spin" around and have no effect on the colour. The colour profile to convert this to CMYK obviously has a limit on the representation that doesn't allow this to be accurately converted forward and then backward - only colours within gamut can do that. Colours out of gamut are clipped to the edge of the gamut and are a best fit or nearest approximation depending on the algorithm chosen. When this happens lots of colours can map to the same colour.

Edited December 12, 2021 by Paul Mc
Expanded answer.