Heh, I've no idea about Photoshop, but here's your image (created with the GIMP):

An "indexed" image has to do with the way the format stores colours. "Plain" image formats like BMP save the colours in RGB mode; that is to say, each pixel is coloured by combining values for red, green and blue. However, GIF images use an indexed colour storage method, for better filesize (and PNG still compresses better
). This means that in the headers of the file, it defines a few colours:
Code:
1: #000000
2: #ffffff
3: #ff0000
4: #00ff00
5: #0000ff
Then, when it wants to reference a colour, instead of using its RGB value, it simply uses the label it's given it; for example, if it wanted to use green, instead of saying #00ff00, it could just say 4. However, this means that if you try to use a colour not defined in this "palette," it won't work.
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