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The reason it happens is that GIF only supports one transparent color whereas many images have a variety of transparent values ranging from 0 to 255. Since transparency is binary we choose values from 0 to 127 as transparent and values from 128 to 255 as opaque. A future version of ImageMagick will permit you to specify a specific color as transparent instead of it deciding based on the alpha channel.
for a discussion on how to make transparency work properly with GIF images and why GIF is a bad choice for transparent images and how PNG is the preferred choice.
Perhaps there is a bug in the PSD image reader. Post a URL to your original PSD image so we can download it and reproduce the problem.
Until we get a patch, try this:
- convert '50cent1.psd' 50cent1.png