I recently stumbled on something curious: the white of the artboard and the white of white objects in Illustrator act quite vastly differently on translucent objects on top of them. For example, this is a 30% black square partially eclipsing a 100% opacity white square on the bottom right corner (boundaries shown by the red markers, the rest is artboard):

enter image description here

Although an intruiging and sometimes helpful feature, I am also concerned about how this will affect my ability to the judge colour and tone of exported translucent images. I am also assuming the lighter tone is a more accurate representation of the final output? What is this feature called, and can I toggle it?

  • Do: View -> Show Transparency Grid, you can recolor the grid from prefs so you can more easily see white. – joojaa Nov 29 '14 at 7:07
  • @joojaa It's not the inability to see white against the artboard I am concerned about, but rather the difference in the tone of translucent colors on top of artboard vs. translucent colors on top of white objects. Often, I still find it useful to have a white background to see how the final image will render. – concat Nov 29 '14 at 7:13
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    Ah, turn View -> Proof Colors on, still seeing the effect? – joojaa Nov 29 '14 at 7:18
  • Anyway this is a feature of cmyk color blending. If you do this in rgb mode you shouldn't see anything. – joojaa Nov 29 '14 at 7:21
  • @joojaa Ah, that's what it is: using RGB space made them uniform. Thanks! – concat Nov 30 '14 at 2:39

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