Black is grey in masks in CMYK mode

[sigmund]

Hey Serif,

stumbled upon this bug that is reproducible on different systems.

Specs: Win10 - Affinity Photo 1.8.5.703

If you have a CMYK/8 document and paint a mask for a layer with total black, the painted result is not totally transparent.

It seems like an bug in the color conversion between GREY and CMYK. Switching the color mode from a color with 0% grey to CMYK shows that the KEY Color/Black is at 88k and not at 100k:

In CMYK mode you can switch the color to 100K and then the transparenccy works as expected. But as soon as you click another layer and get back to the mask the color scheme is switched back to grey and black is not entirely transparent.

To reproduce this:

- Create an new image

- switch to cmyk/8

- create a layer + draw something

- create a mask for the layer, (Click the mask and) paint a total black with gray value 0. You can still faintly see the content you wanted to mask out.

 

 

 

 

 

[,,,]

5 hours ago, sigmund said:

If you have a CMYK/8 document and paint a mask for a layer with total black, the painted result is not totally transparent.

It seems like an bug in the color conversion between GREY and CMYK. Switching the color mode from a color with 0% grey to CMYK shows that the KEY Color/Black is at 88k and not at 100k:

Yes, there's a bug. There should be no colour conversion when painting with greyscale values in a mask or alpha channel.

[10C]

You beat me to this; I was going to post this issue a day ago but ran out of time and didn't get to it - thanks for posting this. I can confirm this is an issue on my system as well; same OS and Affinity version.

Win10 & AF 1.8.5.703

[sigmund]

Thanx 10C and anon2 for confirming that this is a bug.

I hope Serif is putting it on the todo-list to fix this.

[Chris B]

Hi all,

This will now get logged. Thanks so much!

[Tanya P]

Hi all,

it looks like since the last post here over a year ago nothing changed. In the 1.10 version the bug is still there.

[Chris B]

I've bumped the bug report - sorry this hasn't been fixed yet @Tanya P - welcome to the forums.

[zpires]

I came here to report the same issue. Very frustrating.

[ashf]

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[DylanGG]

Still an issue in V2. It even happens in Publisher - which is odd because Publisher is mostly used for CMYK working. Not sure how this was overlooked.

[MEB]

Hi @DylanGG,
Welcome to Affinity Forums
I've updated and bumped the report again to bring it up to devs attention.
Thanks for your feedback and sorry for the inconvenience this is causing you.