Converting PDF Coloring Pages

If you have access to imagemagick you can quickly convert a PDF coloring page(s) to grayscale PNG using the below procedure and notes.

• The pdfimages will get you a dpi listing for each page in the PDF that has an image, use that value instead of 300 in the below, if it is present.
• The -type Grayscale parameter can be removed if you need color output.

1. Install imagemagick
2. pdfimages -list shipspage1.pdf
3. for file in `ls *.pdf`; do convert -density 300 -type Grayscale ${file} ${file}.png; done

• https://stackoverflow.com/questions/50006770/how-to-get-dpi-of-a-pdf-file
• https://jdhao.github.io/2019/11/20/convert_pdf_to_image_imagemagick/
• https://stackoverflow.com/questions/2869908/convert-pdf-to-png-using-imagemagick
• https://legacy.imagemagick.org/discourse-server/viewtopic.php?t=11279