I am using PDFX / Lualatex to create a PDF/X-4 file. My problem is that the publisher is wanting the images in the file to be CMYK. Some of my images are transparent.
- Latex only supports a limited number of image formats and does not allow for TIFF
- PNG images can have transparency, but do not support CMYK colour profiles
- JPG images do support CMYK, but cannot have transparency
So, what is my solution for including a transparent and CMYK image in a PDF file that the publisher will be able to use?