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' backend         > profiles > using icc profiles 'sRGB-v4.icc,CGATS001Compat-v2-micro.icc,sGrey-v4.icc' backend         > profiles > forcing pdf version 1.3, compression level 3, object compression disabled backend         > profiles > permitted colorspaces: rgb 'yes', cmyk 'yes' colors          > defining > supported models: gray 'true', rgb 'true', cmyk 'true', spot 'true' transparencies  > support > transparency is supported

but I thought that rgb and transparency were not appropriate for PDF/X. Am I right about that?

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, either a 'fatal error' which prevents compilation (such as SWOP2006_Coated3v2.icc does) or the file compiles, as in the case, say, of ISO_Uncoated.icc, but the log reads:

backend > profiles > error, couldn't locate profile 'ISO_Uncoated.icc' backend > profiles > invalid output intent 'ISO_Uncoated.icc'

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?

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.

Julian

.

On 5/17/25 07:00, jbf wrote:

[...] 
Recently I set up a separate more recent 2025 version of ConTeXt, and I
get an error with the above intent statement. If I remove intent
entirely, everything compiles correctly.

Hi Julian,

I think this is intended.

[...] 
Two questions:

(1) what has changed with the latest ConTeXt that causes this error with
that color profile?

https://www.pragma-ade.com/general/manuals/standards.pdf#page=2 (also
included in the distribution).

This includes the explanation of the automatic configuration of intents.

Just in case it might help,

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
___________________________________________________________________________________