Quote:
Originally Posted by Dr. Drib
I just do this in calibre:
VIEW (open the PDF file)
FILE
EXPORT
QUARTZ FILTER (change to BLACK & WHITE)
SAVE
I then take the saved file from Documents (Macbook Air) and load the file onto calibre and then transfer it to my Kindle Scribe.
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That sounds like you are using the built in macOS Preview application.