2 Correct answers
Could you tell me more on never use PNG on an ID project please ?
There is no problem using a PNG as an image format for print as long as it is saved as 24-bits, with enough resolution, and an embedded color profile. PNGs can only be RGB, but they can be converted to CMYK on Export if necessary. When you Export an InDesign page to PDF, the original image format is lost—Acrobat’s Object Inspector would not show a difference between PNG, TIFF, or PSD.
But if the PNG was generated from a vector
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Really ?? I never had this problem before.
Here I have a placed Illustrator AI file on the left, and an exported PNG of the AI file on the right:
If I open the AI vector file in Illustrator, I can see there is a rectangle behind the yellow circle with a .1pt stroke.
InDesign doesn’t show the stroke because the background image is interfering. If I hide the image I can see the stroked rectangle in both the PNG and AI files when they are on a dark gray background:
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