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. I have been running into this for years with client supplied pdf files. Unfortunately many of the images they supply need to be edited further than just converting color space. When you select an image using Pitstop and check the color space it reads "indexed on CMYK color", "indexed on RGB color", "indexed on Gray Color" or variations of these including spot color. 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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