There is a 16bit (per channel) version of GIMP.
http://film.gimp.org/

Samuel Benge wrote:

> When will somebody *actually* make a 16-bit grayscale editor that works?
>   One you can actually use paint tools with. I remember Wilbur, but it
> had very unpredictable results. I'm thinking the time is nearing that I
> should make one, since nobody else is jumping to it. I'm afraid it will
> be too slow, however, because I would be using Euphoria, and may or may
> not be able to compile the code.
> The POV-Ray docs give a clue as to how a person might make build the
> colors. I've looked at a 16-bit grayscale image in a paint program and
> keep thinking it might not be that hard to get the red and green colors
> to build up that way. You would just have to make the program paint to
> both the screen as 8-bit grayscale, and paint to disk as the red & green
> version simultaniously..... Then it's a matter of implementing
> alpha-masked paint tools.....
> 
> 
> --
> Samuel Benge
> 
> sbe### [at] caltelcom

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