bob <> wrote:

> >Say you draw a monochrome gradient from black to white along 2560 pixels.
> >You only have 256 different colors, thus you get bands 10 pixels wide.
> >And dithering does not have a real effect in such a case.
> I'm in RGB mode. The image is 2480px wide and 2794px high.

I tried the same size with a gradient from black to white, and another
from red to green. In my opinion, the banding effect is not really
obvious, but maybe my sight is not as sharp as yours. Anyway, it is
still less obvious in the polychrome gradient.

> Is there a way that I can create a smooth gradient?
> Will switching to another colour mode help?

No, it would be worse.

> How can I work this out for myself in the future?

The only possible improvement would be to have 16-bit depth colors.
You'll have to wait for GIMP 3.0...


                        Olivier Lecarme
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