The original motivation for creating CapyPDF was understanding how fully color managed and print-ready PDF files are actually put together. A reasonable measure of this would be being able to generate fully spec conforming PDF/X-3 files. Most of the building blocks were already there so this was mostly a question of exposing all that in Python and adding the missing bits.
It is not graphically the most flashy, but it requires quite a lot of functionality:
- The document is A4 size but it is defined on a larger canvas. After printing it needs to be cut into the final shape. This is needed as the document has a bleed.
- To obtain this the PDF has a bleed box (the blue box) as well as a trim box (the green box). These are not painted in the document itself, Acrobat Pro just displays them for visualisation purposes.
- All colors in graphical operations are specified in CMYK.
- The image is a color managed CMYK TIFF. It has an embedded ICC profile that is different from the one used in final printing. This is due to laziness as I had this image laying around already. You don't want to do this in a real print job.
- The heading has both a stroke and a fill
- The printer marks are just something I threw on the page at random.