Noisy gradient
A gradient with fine noise mixed in to break up color bands and make the fade look smoother.
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What it is
A noisy gradient mixes a small amount of random variation into a smooth color transition. The noise breaks up visible color steps, so banding turns into fine grain that the eye reads as a smoother fade.
Use it on large dark gradients, soft backgrounds, and exports with limited color depth. Add the noise after calculating the gradient, at roughly one quantization step, so it dithers the final colors instead of changing the gradient's shape.
Gotcha: too much noise becomes a texture rather than a banding fix. Lossy compression can clump or erase fine grain, so judge the exported asset at its final size and format.
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Render the gradient at the final output size, then apply subtle monochromatic dithering noise applied equally to the red, green, and blue channels, at about one 8-bit color step, before quantization. Keep the grain fine and stationary, preserve the original color stops, and verify that no visible bands remain after export.