ALl GIF images are indexed images. They all contain a limited 256 maximum (must be a power of 2) 8bit RGB color table, no transparency.
If transparency is wanted, one color index is used to represent a single transparent color. Can be any color, uncluding a duplice of another color in the color table.
2. Naturally it isn't a direct color image, only a limited color index table image.
Convert the GIF to a RGB image before attempting to modify.
This is not a IM problem however.
I'll leave 3. to someone else. I suggest you publish it on the users forum.
Questions and postings pertaining to the development of ImageMagick, feature enhancements, and ImageMagick internals. ImageMagick source code and algorithms are discussed here. Usage questions which are too arcane for the normal user list should also be posted here.
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