Re: [Gimp-user] How undo image dithering that resulted when millions colors image converted to 256?

[Alain Daumail <adaumail gmail com>]

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

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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 http://www.beachware.com/images/peter2.jpg 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.