Our new printer requires PDFs to be submitted as PDF version 1.3 (Acrobat 4). In order to use this setting when we "Save as optimized" we must choose the "Transparency" flattening setting. But every option I've tried for flattening keeps converting the colors to ICC profiles, and the printer also refuses to accept files with ICC profile colors. I can't find any place to select this or not select it as an option, but every option within the Transparency dialog seems to result in ICC profiles. How do I save a flattened PDF from Acrobat without converting the colors to ICC? (These are files submitted by advertisers to our publication, so I have no control over the creation of the original PDF. I just need to re-save these in a format which Quad Graphics will accept, which means flattened and at PDF version 1.3)
[Acrobat Pro 10, Macintosh, OS X 10.6.8]