On 5/18/25 06:46, jbf wrote: > I have to say that I remain confused about the intent statement. Let me > explain my confusion. Let's say my preamble says: > > \setupbackend > [format=PDF/X-1a:2001, > intent=default] > > (or I leave the intent blank), using the latest Context version > 2025.04.28 14:29 LMTX, my log file tells me, amongst other things: > > backend > profiles > using color intent 'sRGB-v4.icc'
Hi Julian, this is exactly what https://www.pragma-ade.com/general/manuals/standards.pdf#page=3 (near the end of the page) explictly states. > *but I thought that rgb and transparency were not appropriate for PDF/X. > Am I right about that?* According to https://en.wikipedia.org/wiki/PDF/X, colors in PDF/X-1a should be CMYK or solid ones (no color composing points of different basic colors). I think RBG and transparencies were adopted in later versions. > If I change intent to one of the color profiles listed on https:// > wiki.contextgarden.net/Input_and_compilation/PDF/PDFX all of them cause > an error, And what happens if you set "intent=cmyk" (from the same page as above)? > There is clearly something I do not understand about how I should > indicate the intent. If the items on the web page indicated above are > 'pre-defined output intents', then why don't they work for me? Can > someone show me exactly how I should fill out the intent= part of > \setupbackend so that I get a valid PDF/X, or indeed can I simply ignore > it and just put in default? "intent=cmyk" should add a CMYK color profile: CGATS001Compat-v2-micro.icc (https://github.com/saucecontrol/Compact-ICC-Profiles?tab=readme-ov-file#cmyk). > Anything I send to print is for grayscale or BW printing, not color. > What I currently do is to use an older 2022 version of ConTeXt where I > have the SWOP profile, and I think it is simply ignored. It certainly > does not cause compilation issues. but the more recent versions do. According to https://www.pragma-ade.com/general/manuals/standards.pdf#page=3, with "intent=cmyk" there is also a gray scale profile added: sGrey-v4.icc (https://github.com/saucecontrol/Compact-ICC-Profiles?tab=readme-ov-file#greyscale). BTW, there might be a minor issue with this in the source. But I’m going to ask in a new thread, since it is really independent. I hope it helps, Pablo ___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / https://mailman.ntg.nl/mailman3/lists/ntg-context.ntg.nl webpage : https://www.pragma-ade.nl / https://context.aanhet.net (mirror) archive : https://github.com/contextgarden/context wiki : https://wiki.contextgarden.net ___________________________________________________________________________________
