How to read and save GIFs with a transparent color?

[Ulf Dittmer]

Hello-

It seems that ImageJ has no notion of transparent pixels in a GIF  
image (or at least none that I can find). Upon opening the  
transparent colors seem to be replaced by some real colors, and I  
can't find a way to specify which color to make transparent during  
saving.

The GifEncoder class seems to have that capability, but it's not  
available the way it's used by the FileSaver class. Am I missing  
something? If not, is there any workaround to this?

Many thanks in advance for any clues.

Ulf

[Wayne Rasband]

In ImageJ 1.39d, due by the end of the week, you can specify the color
to make transparent in the Edit>Options>Input-Output dialog. You can
also save stacks as animated GIFs.

-wayne

On Aug 20, 2007, at 4:02 AM, Ulf Dittmer wrote:

> Hello-
>
> It seems that ImageJ has no notion of transparent pixels in a GIF
> image (or at least none that I can find). Upon opening the transparent
> colors seem to be replaced by some real colors, and I can't find a way
> to specify which color to make transparent during saving.
>
> The GifEncoder class seems to have that capability, but it's not
> available the way it's used by the FileSaver class. Am I missing
> something? If not, is there any workaround to this?
>
> Many thanks in advance for any clues.
>
> Ulf
>