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Unfortunately (at least for my purposes) there appears to be another definition of indexed color where colors not used in a pixel somewhere in an image are eliminated and the color space becomes "indexed". This is a result of compression. I guess the closest analogy would be subsetted fonts where characters not used are eliminated from the set, except in this case it appears to be colors.
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You are 100% correct about your understanding of indexed colors (and Gordo is incorrect) - and I had never thought of that analogy to subset fonts (LOVE IT!)
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Unfortunately many of the images they supply need to be edited further than just converting color space. When you use the object edit tool in Acrobat 7 or 8 you get the message from Photoshop that "Could not complete your request because a color was specified using an unsupported color space." Converting the color space does not eliminate the "indexed".
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Yes, this is a long standing issues between Photoshop and Acrobat...someday we might actually get it resolved...
The only tool that I know of that can "unindex" an image is PDF Enhancer from Apago - it has an option to do that specifically to enable editing as you describe (even though it will now increase the size of the final PDF).
