I did some testing for a commercial printer to produce nice looking separations on rotation offset papers. Typically the designs are separated for CMYK-sheetfed. Especially for the lower grade papers (ECO), applying ICC transforms didn’t bring pleasing results: too flat and lack of color contrast. Using a set of specific compensation curves to transform the sheetfed designs seems a good alternative. Gray balance is becoming more attractive and color contrast is good (Customer was happy with the solution, easy to implement and fast workflow processing). Best regards, Fons Put Senior Innovatieadviseur T +32 (0)14 40 39 93 M +32 (0)495 23 21 34 fons.put@vigc.be<mailto:fons.put@vigc.be> VIGC Kenniscentrum Grafische Innovatie www.vigc.be VIGC - van kennis naar kunnen On 25 Aug 2018, at 21:00, colorsync-users-request@lists.apple.com<mailto:colorsync-users-request@lists.apple.com> wrote: Send colorsync-users mailing list submissions to colorsync-users@lists.apple.com<mailto:colorsync-users@lists.apple.com> To subscribe or unsubscribe via the World Wide Web, visit https://lists.apple.com/mailman/listinfo/colorsync-users or, via email, send a message with subject or body 'help' to colorsync-users-request@lists.apple.com You can reach the person managing the list at colorsync-users-owner@lists.apple.com When replying, please edit your Subject line so it is more specific than "Re: Contents of colorsync-users digest..." Today's Topics: 1. Re: PSO Coated v3 separations (Andreas Kraushaar) ---------------------------------------------------------------------- Message: 1 Date: Sat, 25 Aug 2018 12:58:37 +0200 From: Andreas Kraushaar <andreas.kraushaar@gmx.de> To: Mike Strickler <info@mspgraphics.com> Cc: Colorsync Users List <colorsync-users@lists.apple.com> Subject: Re: PSO Coated v3 separations Message-ID: <23B61456-08D5-4D31-BD93-9869F0FC1629@gmx.de> Content-Type: text/plain; charset=utf-8 thanks :-) FOGRA52 indeed is quite a special printing condition and the higher the differences between printing conditions (both in gamut shape and size) the bigger the challenges. I understand that people expect and easy exchange between any printing conditions but there are some restrictions ... regards Andy Wir stellen den Hintergrund in den Vordergrund. We put the background in the foreground. ————————————————————————— Dr.-Ing. Andreas Kraushaar Abt. Vorstufentechnik Fogra Forschungsinstitut für Medientechnologien e.V. Einsteinring 1a 85609 Aschheim b. München Telefon: +49 89. 431 82 - 335 Telefax: +49 89. 431 82 - 100 E-mail: kraushaar@fogra.org Internet: www.fogra.org ----------------------------------------------------------------- Geschäftsführer: Dr. Eduard Neufeld | Sitz des Vereins: Aschheim b. München | Vereinsregister 4909 Am 22.08.2018 um 23:11 schrieb Mike Strickler <info@mspgraphics.com>: Andy: I also know of at least one profiling applicaion that includes a “flavor” of perceptual rendering for device links that does a very deft job of scaling values close to the white point. I was referring to perceptual tables built into most ouput profiles. These might not always produce a convincing result. In any event, what is clear is that Fogra is not to blame for the paper color, and thus for the characterization. Mike Subject: Re: PSO Coated v3 separations From: Andreas Kraushaar <email@hidden <mailto:email@hidden>> Date: Wed, 22 Aug 2018 22:00:41 +0200 Authentication-results: apple.com <http://apple.com/>; spf=pass smtp.mailfrom=email@hidden <mailto:email@hidden>; dmarc=none Delivered-to: email@hidden <mailto:email@hidden> Delivered-to: email@hidden <mailto:email@hidden> Hi Martin, all, this is a „problem“ or a „feature" with ICC based white point scaling (required for colorimetrical encoding of data). Rendering neutrals from ab=0,0 to ab=2,5 -10 is quite a change and XYZ-scaling from black to white does not reflect the required XYZ to be printed to actually get a decent print. The solution would be to use a perceptual rendering intent that does a grey mapping close to ab=0,0 and not to what XYZ scaling predicts. I know many color server device link profiles (F39 - F52 and also ECI-RGB to F52) that does this job. regards Andy Kraushaar PS: So please believe me that the people that doing this huge (unpaid) efforts also do check the separation, yes! Wir stellen den Hintergrund in den Vordergrund. We put the background in the foreground. ------------------------------ Subject: Digest Footer _______________________________________________ colorsync-users mailing list colorsync-users@lists.apple.com https://lists.apple.com/mailman/listinfo/colorsync-users ------------------------------ End of colorsync-users Digest, Vol 15, Issue 63 ***********************************************