Comments for Jan-Peter Homann

Comment on Book Digital Color Management by Preparing to teach is a learning process | Lukas Engqvist (Artcoach.se)

Preparing to teach is a learning process | Lukas Engqvist (Artcoach.se) — Wed, 18 May 2011 13:52:16 +0000

[...] like to thank Jan-Peter Homann who gave me permission to use some of his diagrams from the book Digital Color Management in my [...]

Comment on Separation of RGB-images by Lukas Engqvist

Lukas Engqvist — Wed, 18 May 2011 13:46:13 +0000

Thank you for the information about these profiles, I have been looking for a place to point people to when holding courses.

Comment on Book Digital Color Management by homann

homann — Fri, 04 Jun 2010 14:06:08 +0000

To Go Jov,
EfI is (now) mentioned with Links to ColorProof XF and the Color Verifier on the start page.
Please see also further information on calibration and profile optimization at proofing
From my point of view, EfI ColorProof has today not a clear differentiation between calibration and and profile optimization. (This may change in future…)
Calibration should be bring the proofer for a defined media / ink combination to a “gold standard” defined by proofing system vendor or by the user.
If the proofing vendor delivers devicelink profiles optimized for simulating printing standards like FOGRA / PSO, GRACoL, SWOP on a calibrated system, the user has to do the calibration ONCE (!!) and all printing standard simulations are spot on.
The currenty available optimization in Efi Colorproof - so far as I know - has to be done for every combination of printing standard and ink / media combination.
If on a proofing system with a semimatte medium three printing standards are simulated, the optimization in EfI Colorproof has to be done for all three combinations.

Comment on Proofing by Madhura Mahajan

Madhura Mahajan — Fri, 04 Jun 2010 13:43:51 +0000

Dear Mr. Hoffman,

Hello. We have an Epson Proofer 7900. It has a star proof rip. How do I know whether it is with or without optimised Device Link Profiles and calibrated for PSO or SWOP or GRACol

Thanks,

Comment on Book Digital Color Management by Go Jov

Go Jov — Fri, 23 Apr 2010 15:12:58 +0000

I am surprised, that author of this book never mention EFI.
i like to what is reason?

Comment on PDF/X-1a by homann

homann — Sun, 07 Feb 2010 20:55:22 +0000

Dear Ecir Hany,
The PDF/X-1a:2003 standard is available, through http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=39938

There is no free version. Based on PDF/X-1a are the GWG specs which could be downloaded free at http://www.gwg.org/GWGversion4.phtml

If you have any questions concerning the usage of the GWG specs, I recommend the GWG forum at http://forum.gwg.org/ (currently a little bit quiet…)

Best regards
Jan-Peter Homann

Comment on PDF/X-1a by Ecir Hana

Ecir Hana — Fri, 05 Feb 2010 16:49:27 +0000

Dear Mr. Homann,

please, I have one question - where can I get PDF/X-1a:2003 standard? Do I have to buy it? I’m asking because I can freely get PDF 1.7 reference from Adobe site so I thought it would be possible to obtain the former spec as well.

Comment on PDF/X-1a by homann

homann — Thu, 25 Jun 2009 15:06:48 +0000

Hello Jay,
With not flattened transparencies in PDF/X-4 I´m critical about following points:
- We have currently not a test scenario, to verify, if RIP (which may has Harlequin instaed of Adobe inside) will render all kinds transparencies according the PDF/X-4 specs.
- If there is a problem with flattening during PDF/X-1a generation, this could be recognized BEFORE sending the data to the printer. Than, Only the PDF/X-1a file has to be created with new settings avoiding the problem.
If PDF/X-4 is delivered, and the problem occureres during the RIP-process, the whole job has to be reprinted.
- We currently have no control elements, that transparencies on a proof or a softproof are rendered according the PDF/X-4 specs.
Probably using Adobe Creative Suite for creation, PDF/X-4 generation and softproof and Adobe Print Engine for Proofing and CtP will avoid most potential troubles. But in my view, an ISO-Standard like PDF/X should not force users to use software only from one vendor.

Comment on PDF/X-1a by mjryder

mjryder — Thu, 25 Jun 2009 02:32:39 +0000

Mr. Homann,

I’ve just received the book and am really excited to dive in. I love the layout and, from my initial perusal, the book seems very practical.

In browsing the book, I noticed your vehement stand for PDF/X1a, which I thought was very rational. The thought occurred to me, however, that PDF/X1a requires files to be pre-flattened, and in today’s world, where Adobe’s PDF Print Engine rules, this struck me as counter to what the PDF Print Engine stands for. Am I misunderstanding the dangers of pre-flattening? or is it just that the benefits of PDF/X-4 etc. are out-weighed, in your mind, by the perils introduced by embedded profiles and mixed colorspace data inherent in the format?

Thanks again for another excellent color management resource,

Jay Ryder

Comment on Book Digital Color Management by Looking for a Color Management Book - Page 2 - PrintPlanet.com

Looking for a Color Management Book - Page 2 - PrintPlanet.com — Tue, 12 May 2009 21:46:14 +0000

[...] Posted by abccolor ISBN 978-3-540-67119-0 springer.com More info on his book here: Jan-Peter Homann � Book Digital Color Management I’m ordering it too. Regards, [...]