Saving PDF files

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You can use the Save As command to save RGB, indexed-color, CMYK, grayscale, Bitmap-mode, Lab color, and duotone images in Photoshop PDF format. Because the Photoshop PDF document can preserve Photoshop data, such as layers, alpha channels, spot color, and notes, you can open the document and edit the images in Photoshop CS2 or later. You can also use the Photoshop PDF format to save multiple images in a multipage document or slide show presentation.