I need to include several pages of pdfs in a book. The pdfs are scanned text documents, image only, with no security applied. When I open the pdf on my mac pro with photoshop cs6, I can make adjustments in the curves dialog, but when I close the dialog the adjustments disappear. The history pallette shows the action, but nothing happened. Also can make visible changes in a curves adjustment layer, but when I flatten the image the changes disappear. I've tried opening the pdf as grayscale, rgb, and cmyk; same result. I've also saved it in several different formats, then reopened it; same result. The file initially opens as a background layer with a locked symbol in the layers pallette. If I duplicate the layer and delete the background, the locked symbol disappears, but photoshop still won't accept changes made in the curves dialog. I tried it with cs4, and had a friend try the same things with on a pc; same result. Levels adjustment won't work, either. Can anyone tell me what's going on here?
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