Hello list, hello roger.Fine to see, that at least one person is interested in this project. As I´m a "stupid Mac user, unable to work with terminal" I would like to concentrate on conception and testing of the devicelink profiles.
Hopefully, some others are interested to create the devicelinks and upload them for further tests. For the beginning, I will give a short introduction by optimizing printing-data with devicelink profiles:
We have three main cases: 1) Color conversion betwen two printing standards 2) Limiting the Total Amount of Color for a defined printing standard 3) GCR resepration / Inksaving for a defined printing standard. For 1) we always have two differnt profiles for source and destination For 2) and 3) the profiles for source and destination are always the sameThe goal of 2) and 3) is to optimize the printability of data for a defined printing standard.
For the beginning, I would like to construct a devicelink which limits the TAC to 300% for offset printing on coated paper according ISO 12647-2. The reference characterization-data for this printing standard is called FOGRA39 and available at www.fogra.org. Very popular profiles based on this characterization-data are "ISOcoated_v2_eci.icc from www.eci.org or "coated_FOGRA39.icc" from www.adobe.com
As source and destination profile are the same, the gamut mapping could be classical ICC, relative colorimetric.
DeviceLink-profiles for limiting the TAC need to preserve the original separation of the incoming data. As i understand the docs for Argyllcms, this will be provided by the parameter -kt. But only specifying -kt as parameter should preserve 400% color in input more or less to output. To define an inkliimit of 300% we also have to set the parameter -l to 300%
It would be nice, if somebody would calculate such a profile and sends it to for further testing.
Thank You and regards Jan-Peter If somebody Roger Breton wrote:
Hello Jan-Peter,In the graphics arts scene are more and more projects, which are using devicelink profiles for the optimizations of printing data.Yes, I agree. Das ist richtig.Reading the manual, Argyll has a lot of interesting features for this market (even if I miss some details like e.g. handling purities in CMYK_2_CMYKcolor conversions).Maybe in release 0.95?Graeme and other: What do You think about the idea to calculate some devicelinks with argyll based on FOGRA / GRACoL / SWOP characterization-data and make them under a Creative Commons "Attribution-Noncommercial-No Derivative Works licence" public available.Absolutely!The documentation for these Argyll devicelinks would include all parameters, how they have been created with Argyll.Sounds so good :)This Argyll devicelinks could e.g. be send to PIA/GATF for the following project: Printing Industries of America/Graphic Arts Technical Foundation (PIA/GATF) is conducting a new public research technology project (leading to a public report) on ink optimization (a.k.a. ink saving, ink reduction) technologies and products. We have already identified and approached about 10 vendors who have commercially available products claiming to improve ink saving for printing (Newspaper, Publication, Commercial, etc.), but I am sure that there are solutions that we may have overlooked, so I have decided to open the call to this list.Wunderbar suggestion!! Argyll DeviceLinks should be included in the project.If you are a vendor of such a product (and I have not already made contact with you), or as a user know of a product you want to make sure that we do not overlook please feel free to e-mail me at research@xxxxxxxxxxxGood idea. I'll send a mail to Eric ;-)Regards Jan-PeterMfG, Roger Breton
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