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 17/5/25 16:20, Pablo Rodriguez via ntg-context wrote:
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
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