May be you would try
- Change image scale & size to 400% to make room for smoothing
- Then use a G'MIC filter
Filter/GMIC/Repair/Recursive median ( seems to work well on your sample) Fiiter/GMIC/Repair/Smooth[Anisotropic] or [Median], [Thinbrush], [Upscale]... (are other options)
- Then reduce scale & size as needed


Le 01/11/2015 04:56, AppStoreWannabe a écrit :
Hi everyone,

I have very old (circa 1995) computer art that is 256 colors. It is all cartoons
(you can see for an example).

The original high resolution art is not available. So I want to take the 256
color computer screen art and change it to millions of colors (24 bit) art.

But the original reduction to 256 colors resulted in dithering. In that example
URL I just mentioned, you can see the alternating pixel colors used to fake the
appearance of colors not in the 256 palette.

What's the best way to take that 256 art and make the areas look smooth and not
dithered? I'm a part-time software developer, not an artist, so I'm hoping for
an easy solution.

When I first tried fixing it, I couldn't find a good way using GIMP on Mac OS X.
The Despeckle filter on a very old version of Adobe Photoshop worked okay, but
that computer is no longer available.

Thank you very much for sharing your knowledge.

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