Gradient Map terribly off-color when using CMYK values

[kaffeeundsalz]

Hi there,

Here's some really odd behavior that I just noticed after I added a Gradient Map Adjustment: I pick a gradient node, switch the color picker to CMYK and play around with the sliders. What happens next is that the color of the node is completely different from the color in the color picker. Please see the attached screenshot for an example:

I first thought it has something to do with my color management settings, but it hasn't because it only happens with the Gradient Map adjustment. In all other gradient dialogs, for example Fill or the Gradient Overlay Layer Effect, everything's fine. It also doesn't matter what Color Profile is set for the document. This happens in the latest versions of all three Affinity apps.

Can anyone tell me what I'm doing wrong?

[Dan C]

Hi kaffeeundsalz

Thanks for your report, I've been able to replicate this here and I can confirm it affects Mac only. I've tried changing from Metal Compute to Open GL, however this hasn't alleviated this issue.

I'll get this logged with our development team now, many thanks for bringing this to our attention!

[kaffeeundsalz]

Thank you @Dan C. I had hoped that I had just missed a setting or so. That's why I didn't post it directly in the bugs forum section. Glad I could help.

[kaffeeundsalz]

Any chance this could be brought to the developers' attention again? The issue is still not fixed with the 1.8.4 updates. Here is a different description of the same problem:

 

[Dan C]

I've bumped this again with our developers and included a link to the forum post above - unfortunately there's no further updates regarding this issue I can provide currently, my apologies for any inconveniences caused.

[hannah]

Unfortunately I am still experiencing this painfully persisting problem (MAC, Publisher 1.10.5):

Something with the gradient map in cmyk is not working, especially in the blues and greens. It makes some basic graphic design moves impossible:

The bar on top of the typo should 100% match the background-black in the dark areas, but it's completely shifted to the blue. It's so frustrating and at best, time-consuming if not impossible to find different solution.

 

 

[hannah]

There is a somewhat effortful workaround I found for matching my blacks to a predefined rich black (lets say 60/40/40/100).

+ You've to start with a K-only image or use the black-and white adjustment layer.

+ Then you can use the Channel Mixer and give each colour the desired value on the "black" slider. So for Cyan the output channel would be 0/0/0/60. For Magenta it would be 0/0/0/40, etc, etc, etc

You can see in the picture that the second rectangle merges now into the background. It solves my specific problem, I hate it though!

 

Otherwise LOVE the programs

 

 

[Dan C]

Hi @hannah,

Many thanks for the update & I'm sorry to hear you're affected by this issue.

I can confirm this is logged with our development team as a bug, so I will be sure to 'bump' this with them now & add the above provided information regarding the Channel Mixer workaround, to hopefully assist in the issue being resolved ASAP

I hope this helps