Overlay PDF

This Drawbot script will take two PDFs and overlay them to help highlight differences.

Each PDF is converted to a specified color, and then layered with a multiply effect. The result is saved to a new PDF file.

Notes

• Multiple page PDFs are supported.
• The source PDFs are rasterized, so you should adjust the pdfScale variable as needed, to balance quality with speed and file size.
• My use case is in showing differences in versions of typeface proofs, but it will accept and B&W PDF.
• It hasn’t been extensively tested, outside of my specific use case.