Indeed, Pablo, everything went well and the printers are happy with what
they got. I did a lot of experimentation with different things (won't
bore you with all that), using both my 2022 version and the more or less
latest 2025... discovered, among other things that the 2022 version is
much more forgiving in this area, so clearly later versions of ConTeXt
have tightened things up. But one difference is that if I put
intent=default in when using the 2022 version, it complains immediately
that it can't recognise it... and that is true, because it the
colorprofile.xml does not include that. Using a 2025 version,
intent=default gives a whole range of possibilities:
backend > profiles > profile specification 'sRGB-v4.icc' loaded
from
'/home/julian/data/context/tex/texmf-context/colors/icc/context/colorprofiles.xml'
backend > profiles > setting 'sRGB-v4.icc' as default 'rgb'
color space
backend > profiles > profile specification
'CGATS001Compat-v2-micro.icc' loaded from
'/home/julian/data/context/tex/texmf-context/colors/icc/context/colorprofiles.xml'
backend > profiles > setting 'CGATS001Compat-v2-micro.icc' as
default 'cmyk' color space
backend > profiles > profile specification 'sGrey-v4.icc' loaded
from
'/home/julian/data/context/tex/texmf-context/colors/icc/context/colorprofiles.xml'
backend > profiles > setting 'sGrey-v4.icc' as default 'gray'
color space
backend > profiles > setting output intent to 'sRGB v4 Minimal'
with id 'Custom' for entry 1
Now, while the cmyk colorspace does not happen to be the FOGRA39 one, my
printers tell me that they can easily make the adjustment themselves,
but they also had no difficulty with what I sent them as a product
produced by the 2022 version where I had used SWOP2006_Coated3v2.icc, so
in other words they made their own internal adjustments without
difficulty, which effectively resolved my problem.
Maybe I caused myself a 'storm in a teacup' as the saying goes. But I
suppose what I was trying to do, in addition to resolving something that
might have meant loss of money, was to actually understand what is going
on in this area. Your explanations have been most helpful in this
regard, though I still confess it is all a bit too confusing for me, due
to my lack of knowledge. In my internet 'reasearch' I discovered that it
is equally as confusing for many others in a range of other programs
other than ConTeXt.
I think we can leave the matter to rest for now.
Julian
On 19/6/25 05:09, Pablo Rodriguez via ntg-context wrote:
In any case, I hope everything went well with the documents.
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