On 5/18/25 11:13, jbf wrote:
[...] In other words, if rgb is permitted and transparency is supported, is this acceptable?
Sorry, Julian, but I took the following for granted and it’s important that I make it clear first. I tried to help, but I’m able to do it only to a certain extent. This is similar to “I’m not a lawyer and this isn’t legal advice”, I’m not a (printer|PDF/X validator) and this cannot be printing advice (only some information). PDF/X are a series of ISO standards. I don’t have the resources (mainly, time and income) to spend 105€ (my currency) in less than twenty pages (to end having a hard time to even understand them). Besides, I have myself no use for it. In theory, you cannot have rgb and transparency in PDF/X-1a. But as theory and practice may only differ in practice, it might be different in practice. Here comes my personal take on the PDF/X-1a format for \setupbackend. If your PDF document is validated against the standard (using a program), it may be automatically rejected. But if it isn’t, your document may have no problem as long as it doesn’t contain other than grayscale colors and the grayscale output intent and color profile. Again, this is as far as I understand. Sorry, but it is beyond my knowledge and I cannot pretend I know what IngramSpark will do with the PDF document you send them. I hope it is clearer now, Pablo