Which pdf has an image mask?

Hi guys,
I am making a document in InDesign with many linked pdf as graphics and charts. When i export the InDesign document to PDF it says it has some Image Mask that were not downsampled. How can i tell which of my PDF has an image mask?
Thanks for any info,
Cheers,
S

Hi,
placing an image wich is not entirely displayed in an image area cause an image mask.
See attached screengrab, the second picture (with the brown area) will create an image mask, in InDesign as in any other software.

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