January 2016 - colorsync-users

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by grant＠grantjohnson.net 08 Jan '16

08 Jan '16

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What to do if a CMYK image has no profile?
by Serge Paulus 08 Jan '16

08 Jan '16

Hello, I’d like to find a way to manage images without ICC profiles ; the only way I do that actually is by converting to profile in various ICC profils and use the preview to see the alterations. But it’s hazardous and I’d like to know if there could be another way to give a chance to those images… -- Serge Paulus Teacher, ESA Saint-Luc - Ihecs Adobe Education Leader Adobe Certified Photoshop Expert, Adobe Certified Instructor www.serge-paulus.be +32 474 63 67 44

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Multi-color ICC profiles
by Roger Breton 06 Jan '16

06 Jan '16

Hi all, I'm looking for sample multi-color ICC profiles, for educational purposes. I have not had the opportunity for profile a printing press this way yet myself :( If you happen to know a link where I could find some, please, let me know. Or if you have one you can share. Thank you so much in advance, / Roger Breton

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Re: FOGRA39 CMY-only profile (no black)
by Mike Strickler 05 Jan '16

05 Jan '16

Sometimes it's tempting to try to help someone solve a problem just because we can, without asking whether it's really a problem after all. If I understand this correctly, the end goal is to limit the use of black in an output profile. Passing for the moment on whether the objective is a sound one, I might suggest that you start with full CMYK data set and edit the black generation in the profiling app. There you make the black as skeletal as you like. As for free beer, let's say that i1Profiler can be had for about the same as 60 bottles of fine Belgian ale at my local yuppie market. Mike Strickler MSP Graphic Services > ------------------------------ > > Message: 3 > Date: Tue, 05 Jan 2016 13:28:48 +0000 > From: Martin Orpen <martin(a)idea-digital.com> > To: "'colorsync-users?lists.apple.com' List" > <colorsync-users(a)lists.apple.com> > Subject: Re: FOGRA39 CMY-only profile (no black) > Message-ID: <02E4B32E-C087-46ED-AB81-A8CF4B91E351(a)idea-digital.com> > Content-Type: text/plain; charset=utf-8 > > >> On 5 Jan 2016, at 11:50, Jorge . <chocolate.camera(a)gmail.com> wrote: >> >> Maybe I am making this too convoluted and I should not be trying to do this by creating a custom profile? Is there any other way to convert to a specific CMYK color space, preferably with Photoshop, but altering the default separation algorithm so that K is not used and CMY are increased in order to compensate that lack so that colors remain as close as possible to the original, taking also into account a custom TAC? I do understand that the deviation from the original colors will inevitably be higher on black-ish tones if no K is used. > > > I’m not sure what else you’d expect to happen here? > > If you build the ICC profile in Argyll using -kz -l300 -L0 you are going to create CMYK with no K and the CMY channels compensating as best they can for the missing K. > > Keep in mind that you'll need a pro CMYK proofing system to appreciate and validate the results of these conversions — Photoshop isn’t going to be very useful… > > And, if you want to keep things really simple, why not just invert the RGB channels and avoid black generation altogether ;-) > > -- > Martin Orpen > Idea Digital Imaging Ltd > >

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