PDF 1.4 debuted in Acrobat 5 at this time as the first version of PDF that supported transparency. New tools allowed us to apply editable transparency effects to text, graphics, and images, the result being a greatly enhanced set of design tools. With the release of InDesign 2.0 back in 2001, Adobe integrated transparency effects directly into its layout program. When you go to save or output your file to pdf, you may see the above warning – and it is an important one! If you have used a spot or PMS color in your InDesign, Quark or Illustrator layout and then applied some type of transparency effect - drop shadows, blending modes, gradients, feathering, etc - then this warning is telling you that your file will NOT print correctly. Your file will look fine on screen, and often even when printed from a desktop printer, but high quality print output will be compromised. Controlling your Swatches palette and color usage, and understanding color definitions, can prevent this problem. But when you place a spot color logo, for example, in a project bound for CMYK process printing, you may be setting up a conflict that can ruin your print output. Using a spot or PMS color in a layout often makes sense to the designer – after all, we all want to ensure correct color output across our brand.
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That content is included below, but in addition we added some more information on how to resolve this conflict if you have already created your files in InDesign or Illustrator and either been contacted by your printer for file revisions, or worse, received a print job with “unexpected results.” We discussed the conflict between transparency and spot colors, and the ensuing print problems, in a previous blog post.
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