| Summary: | Add dithering to gradients | ||
|---|---|---|---|
| Product: | [Applications] krita | Reporter: | Raghavendra kamath <raghu> |
| Component: | General | Assignee: | Krita Bugs <krita-bugs-null> |
| Status: | RESOLVED DUPLICATE | ||
| Severity: | wishlist | CC: | griffinvalley, halla, karl |
| Priority: | NOR | ||
| Version: | git master (please specify the git hash!) | ||
| Target Milestone: | --- | ||
| Platform: | Other | ||
| OS: | Linux | ||
| Latest Commit: | Version Fixed In: | ||
| Attachments: | gradient banding | ||
We'll need to look into high bit gradients and then dithering for converting them to 8 bit to really resolve this. Setting to wish: dithering is a new feature. Maybe we can just nick gimp/gegl code for this? Sorry for taking this different tangent. I think dithering should be in how colors are mixed and shown on screen and not just in gradients. for example there will be banding when you convert from 16 bit to 8 bit and sometime the look of the image will change drastically due to this. So i think dithering should be added to converting images , and if possible everyplace where there is a possibility of seeing a banding. A work around for this situation is to add noise spread filter from gmic It turns out we have an abandoned branch and phab task for this alread: https://phabricator.kde.org/T863, where Wolthera has also mentioned other places where dithering should be used when working in 8 bit. And we already had a wish for this... *** This bug has been marked as a duplicate of bug 343864 *** |
Created attachment 117268 [details] gradient banding SUMMARY When applying multiple successive gradients (foreground to transparency) one above other, we get bandings and undesired color variations. According to discussion on IRC this is due to dithering problem. the bug is seen prominently when working with colors close to black and you draw it on a new layer. Drawing on an opaque white layer reduces the banding a bit. I have attached a png file with multiple gradients you can see banding in the middle, and if you zoom in you can see reds and greens in the colors. this becomes a hassle when color picking and painting too. STEPS TO REPRODUCE 1. Open a New document in Krita, switch color to close to black near red spectrum. 2. Choose the gradient tool and go and adding radial gradient successively one above another OBSERVED RESULT Bandings appear when applying successive gradients EXPECTED RESULT gradients should be dithered and smooth gradation should be produces SOFTWARE/OS VERSIONS Operating System: Arch Linux KDE Plasma Version: 5.14.4 Qt Version: 5.12.0 KDE Frameworks Version: 5.53.0