Exporting PDF with black and white photos- WHY IS IT SO LARGE?
I have had this issue for over a year now. I do a lot of "treatments" for photo clients. Basically indesign docs of full spread images with a little type here and there, exported as PDFs. When I make these it is always easy to export them and get the pdf file size somewhere around or under 12mb with some compression and color space adjustment.... UNLESS! Unless the imagery I'm using is black and white! Its not greyscale, its an RGB image but with black and white adjustment from lightroom and then exported as a tiff or jpg. If I were to make two identical indesign files and export two pdfs with the exact same settings, one with color RGB images and one with black and white RGB images one, the color would read 13mb and the black and white would read 85mb. WHAT AM I DOING WRONG HERE?? My only poor solution so far is exporting a pdf and then running it thought acrobat to downsize it again, just to get the file slightly smaller but its still usually well over 12mb. PLEASE HELP
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