This is a simple Automator workflow that converts a PDF file to high contrast black and white. To install, download the release from https://github.com/z-aki/pdf_high_contrast_bnw_macos_automator/releases/latest and open the .workflow file with "automator installer".
Right click on a single PDF file in Finder, then select "quick action" > "pdf_high_contrast".
The output will be saved in the same directory as the original PDF file with the suffix _contrast.pdf.
The temporary file will be in /tmp folder
This is a simple Automator workflow that downsizes selected images (PNG/JPEG etc) to 50% of their original size. Repeated usage will continue to downsize the image by 50% each time.
Right click on a image files in Finder, then select "quick action" > "downsize_image".
The resulting images will be in the same folder as the first image file with the suffix. Original files are not modified.
This reduces the gamma of a PDF file to reduce its contrast. This is useful for PDFs that are too dark or have too much contrast. It can also be used just before the above high-contrast workflow for such PDFs.
With github account: watch button on the top right of the repository page.
Without github account: RSS feed
https://github.com/z-aki/pdf_high_contrast_bnw_macos_automator/releases.atom
Blog: https://z-aki.github.io/automator/automator/
