Call pdftopng in python instead of subprocess #269
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Using the poppler backed failed for me because I was running it from an un-activated venv and pdftopng was not in the PATH.
My original workaround was even shorter - I imported the convert function directly into the PopplerBackend class. But this import will fail on initialization if pdftopng is not installed and will prevent using the ghostscript backend, so I converted it to late import.