1 NAME=whatever-name 2 # Might want to consider using -normalize, -auto-level, -auto-gamma, -contrast-stretch '10%', etc. Enhances for greyscale documents 3 convert $NAME*png -level '15%,75%' -auto-level tmp.pdf 4 pdf2ps tmp.{pdf,ps} 5 ps2pdf tmp.ps $NAME.pdf
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Convert multipage PDF to PNG and back (Linux) - Stack Overflow
1 # 150 dpi (default) 2 pdftoppm -png file.pdf prefix 3 # 300 dpi 4 pdftoppm -rx 300 -ry 300 -png file.pdf prefix
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