Acme GiFEncoder: java.io.IOException: too many colors for a GIF

I have been using the Acme GifEncoder to save images as gifs. I have been using this quite successfully until today. For some reason it now gives an error when I try to use this in some circumstances. The exception is:
java.io.IOException: too many colors for a GIF
I am not sure why it will work in some situations and not others. If anyone can give any insight on this problem then I would appreciate it.
Thanks

Thanks for the reference to the quantizer. I will try it out and see if it works.
That is going to lead me on to have a bit of a rant about GifEncoders. I realise that gifs are limited to 256 colours. It is ridiculous that a GifEncoder would not limit the number of colours for you. If you have an image in another format such as jpg that does not have a limit the number of colours, the encoder is not able to convert it into gifs unless it has the number of colours reduced. As far as can tell this should be an essential function of the encoder, unless anyone can tell me differently.
Also if anyone can advise me on the Acme JpegEncoder I would appreciate it. It does not seem to work in any shape or form. I am not trying to do anything in particular with it now, so I have no code to show. I did try to use it before and it did not seem to work, so if anyone knows how to get it to work that would be great.
Once again, thanks for your help.

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