Downsampling of coloured greyscale-Images
... does not work correctly.
Example:
An uncolored grayscale image and the same colored grayscale image are reduced differently
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 Maik Spreen
    
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Maik Spreen
    
 shared this idea
      
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       rudolf
    
 commented rudolf
    
 commentedYes, i can confirm this. Seems to be OK in InDesign (high quality) preview, but damaged in exported PDF, like in Maik’s "downsampling-bug.pdf". Tested on macOS 10.12.6 and InDesign 2018 (13.0.1). 
 
          