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Chapter 5. Drawing > Transparency

Transparency

Hands down, InDesign’s sexiest feature is its transparency effects. These include drop shadows, feathering, support for transparency inside Photoshop and Illustrator graphics, changing an object’s opacity or blending mode... the list goes on. But before we go any further with this wild transparency talk, we just need to be clear about something: PostScript’s basic drawing model does not allow for transparency. Period.

So how does InDesign print transparent objects to a PostScript printer? Simple: it cheats. When the time comes to print, InDesign uses clipping paths to create the illusion of transparency and/or rasterizes the transparent objects and sends the printer separated image data. All of this takes place in the background—InDesign does not change the objects in your document. Instead, it changes the way that the objects are sent to the printer.


  

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