I apply a red glow on an object (rectangle) on an black background.When exported as JPEG or PDF, the red glow color faded become greyish. I check that it's same when I turn the proof colors on.I've change different modes for the drop shadow but none gives the correct result.
This only happens in CMYK mode. When exported as RGB, it's fine.
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What transparency mode did you use?
I tried all, none gives the correct result in CMYK environment.