Besides going back to the original file, there are now lots of different ways to change colour content in a PDF file:
• Use the Convert Colour option under Advanced/Print Production for conversion from RGB, ICC-based and Calibrated colour - also great for aliasing Pantone inks to process.
• If you just want to alias colours such as Pantone to process or Pantone to Pantone then use the Ink Manager once again under Advanced / Print Production.
• The touch-up object tool is great for editing small areas of colour not matter if its a bitmap or vector. Acrobat uses Adobe Photoshop as a bitmap editor and Adobe Illustrator as a vector editor - just select the object and then right-click (Windows) or control-click (Mac) and then Edit Image (Photoshop) or Edit Object (Illustrator). This will now launch the corresponding application for the edits to be made. Once saved, the changes will reflect inside Acrobat.
• Just for single bitmap objects, then right-click (Windows) or control-click (Mac) and then select the Colour tab and use the supplied profiles to change the colour-space of the bitmap within Acrobat.
• Finally, don’t overlook the new fixups from within the Advanced / Preflight category. Lots of new ways to convert not just colours globally but different types of objects such as text, line art, images etc.
This FAQ was written by [url=http://www.acrobatusers.com/community/profile/jon.bessant/]AUC Expert Jon Bessant[/url].