Bug 492146 - Some colors do not exist for blending
Summary: Some colors do not exist for blending
Status: RESOLVED NOT A BUG
Alias: None
Product: krita
Classification: Applications
Component: * Unknown (show other bugs)
Version: 5.2.3
Platform: Compiled Sources Microsoft Windows
: NOR normal
Target Milestone: ---
Assignee: Krita Bugs
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2024-08-24 21:20 UTC by Norsq
Modified: 2024-08-27 12:00 UTC (History)
1 user (show)

See Also:
Latest Commit:
Version Fixed In:
Sentry Crash Report:


Attachments
idk if you can see it but it's the two greys im talking about (1.15 MB, application/x-krita)
2024-08-24 21:20 UTC, Norsq
Details
Screenshot of the canvas + layer thumbnail (211.78 KB, image/png)
2024-08-25 09:43 UTC, Halla Rempt
Details
sorry for bad explanation. the video attached is of me showing the colors not blending meanwhile on other colors they do blend (82 bytes, text/plain)
2024-08-25 10:02 UTC, Norsq
Details

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Description Norsq 2024-08-24 21:20:39 UTC
Created attachment 172915 [details]
idk if you can see it but it's the two greys im talking about

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SUMMARY
Some colors do not exist for blending, if i use a grey and i put a lighter grey even if i blend them with a blending tool, taking it from the wheel a color in between does not exist, if i try to export a photo with the color that should be in between it just makes it one of the two greys instead of the mix. I know this is a problem that only i have as i asked other krita users and they said they could blend the two colors.

STEPS TO REPRODUCE
1. use any brush with a darker color
2. put a lighter color
3. blend them

OBSERVED RESULT
no color in between.

EXPECTED RESULT
a nice blend with all the colors in between.

SOFTWARE/OS VERSIONS
Windows: 10 pro
macOS: 
(available in the Info Center app, or by running `kinfo` in a terminal window)
Linux/KDE Plasma: 
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION
i did try to install krita again but it did not fix
Comment 1 Halla Rempt 2024-08-25 09:42:23 UTC
I'm not exactly sure what you mean, but the file you have attached _is_ strange: the image is rendered as if it is filled with a two-tone gray gradient and differs from the thumbnail.
Comment 2 Halla Rempt 2024-08-25 09:43:18 UTC
Created attachment 172931 [details]
Screenshot of the canvas + layer thumbnail
Comment 3 Norsq 2024-08-25 10:02:46 UTC
Created attachment 172932 [details]
sorry for bad explanation. the video attached is of me showing the colors not blending meanwhile on other colors they do blend
Comment 4 Halla Rempt 2024-08-27 11:56:23 UTC
Hi Norsq!

After some discussion, we figured out what's up. The layer thumbnail is weird because the layer is much bigger than the image. The banding issue is because you're using a linear gamma profile on an 8 bit image. Please check this chapter in the manual for an in-depth explanation: https://docs.krita.org/en/general_concepts/colors/linear_and_gamma.html
Comment 5 wolthera 2024-08-27 12:00:11 UTC
Hi,

I suspect what you're experiencing is what we call "banding" (as in, gradients become bands of color). This is because you're trying to use a linear profile with 8bit color depth, and there's no enough bit depth in 8bits to be able to have a visually smooth gradient. You will need 16bit at minimum to get a smooth greyscale in a linear profile, or convert to an sRGB trc profile.

To do so, go to image -> convert image color space.

There, either choose:
1.  RGBA, 8bit integer/channel, sRGB-elle-v2-srgbtrc.icc
2. _or_ RGBA, 16bit integer/channel, sRGB-elle-v2-g10.icc

1. is the more conventional setup, 2 is a lot heavier on the computer but the gradients tend to mix nicer. See https://docs.krita.org/en/general_concepts/colors/linear_and_gamma.html for details.

If this doesn't fix your issue, we'll need more information on what is going on.