Update compare_pdf.sh #1211
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Update compare_pdf.sh #1211
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* Add usage message if no parameters are provided. * Add 3rd optional parameter to set temp directory and ensure that it is empty. * Use png24 colour depth for the `convert` calls to avoid warning about RGB colour space permissions on greyscale PNGs. * Quote all filenames.
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Some minor tweaks to
compare_pdf.sh:convertcalls to avoid warning about RGB colour space permissions on greyscale PNGs.