When saving as PDF, downsampling does not function for images that are part of a transparency mask
Windows 10 - Illustrator CC Desktop
How to create issue:
Place a linked image. Use linked image with another object to create a transparency mask. Save as PDF. Adjust downsampling options. View created PDF with a PDF viewer and see that the image did not get downsampled. Also, look at file size of created PDF.
Release the transparency mask and resave with all other variables identical to other saved file. Open the file in a PDF viewer and see that it is properly downsampled. Also, look at file size and see that it is smaller than the other created PDF.
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Windows 10 - Illustrator CC Desktop
How to create issue:
Place a linked image. Use linked image with another object to create a transparency mask. Save as PDF. Adjust downsampling options. View created PDF with a PDF viewer and see that the image did not get downsampled. Also, look at file size of created PDF.
Release the transparency mask and resave with all other variables identical to other saved file. Open the file in a PDF viewer and see that it is properly downsampled. Also, look at file size and see that it is smaller than the other created PDF.