Every time we try to crate smooth color transitions we experience Color Banding. This occurs because Krita doesnt have built in dithering not because our 8-bit collor depth. (Using higher bit depth with dithering will result even smoother gradients but without dithering we will get just denser banding)
To achieve dithering in brush we will use Randomness and Density
Randomness will intordouse soft noise but doesn’t do good job at dithering color bands.
Density will introduce deep dithering. This is what we need to soften Collor Banding but we can endup with noisy image if we dither over few color bands.
Examples and Brush Settings
Airbrush Soft 80% Density
Airbrush Soft 20% Randomness
Examples and Blend Brush Settings
We can enchance build in Blender Blur brush by setting its density in thic case to 80%
Using Blender Blur brush with density set to 26% and moving it along the color band will introduce proper dithering to a gradient.
Gradients and Filters
If we want to smooth big sufaces and we dont care about loosing detail we can use Filter->Other->RandomPick
Dithering manually may result in noisy image so some practice and experimentation need to be put in to achieve good results.
I hope someone will find this helpful