October 2015 - colorsync-users

Has Apple really opened the 10-bit display path in El Cap?
by Peter Harris 30 Oct '15

30 Oct '15

http://www.macrumors.com/2015/10/30/4k-5k-imacs-10-bit-color-depth-osx-el-c… And what does this mean for a possible entry into the medical imaging market, whose DICOM standard requires 10 bits in the display path? Have not gotten my hands on a machine to test the 10-bit gray ramp that would confirm. Peter Harris Programmer/Analyst Staff Research Associate Baskin Visual Arts Studios University of California Santa Cruz Santa Cruz, CA 95064 831.459.3107 831.459.1028 http://therealpeterharris.com

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Re: DCI P3 gamut
by Paul Sherfield 23 Oct '15

23 Oct '15

Hi I think the P3 re the new iMac screens refers to the DCI P3 spec. See this link for more info: http://www.noteloop.com/kit/display/color-space/dci-p3/ Seems to be around 93% of Adobe RGB. Regards Paul Sherfield Telephone : + 44 1442 207626 Mobile: + 44 7899 906385 http://www.missinghorsecons.co.uk http://twitter.com/#!/missinghorse Apple Solutions Expert - Print & Publishing Member - UK TC130 Technical Advisory Group (ISO 12647 Printing Standards) UK Expert: ISO TC130/Working Group 13 on certification of printing standards Chair BPIF UK ISO 12647 Certification Steering Group Member - BPIF Technical Committee Lean and green? To save money and become a greener printer, see http://www.greenprinter.co.uk http://www.keeconsultants.com Reduce your carbon footprint http://www.1010uk.org This email and any attachments may be confidential and are intended solely for the use of addressee. If you are not the intended recipient of this message, any disclosure, copying or other distribution is strictly prohibited and may be unlawful. If you have received this message in error, please notify the sender and delete all copies from your system. Email may be susceptible to data corruption, interception and unauthorised amendment. We do not accept liability for any such corruption, interception or amendment or the consequences thereof. We do not accept liability for any action or inaction by the recipient as a result of advice or information contained within this email. >

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New Mac OS - little things that are most annoying
by Mark Stegman 19 Oct '15

19 Oct '15

I know this is not about colour but it is a Mac forum... I (bravely) upgraded to the new Mac OS X (El Capitan). It immediately disabled my USB hub which meant I had to reconfigure my connected devices in order to connect one 8gb USB flash drive to my Mac Mini 1TB Fusion Drive where the sockets are inconveniently located out of sight at the back of the machine and so close together you have to pick it up to get them in. But it looks nice. I then opened the Disk Utility which I discovered had been redesigned in order to format the USB drive to give to someone with a PC. The new Disk Utility looks nice too however, after formatting the flash drive it was unreadable in any PC. I formatted the same USB drive in a PC as FAT 32. It only allowed me to create a single partition of 200mb. When I plug it back into the Mac I have two partitions: one with the original data that should have been erased when formatted in the PC, and new files that I copied from the PC for testing. I repeated the task using ExFat. Same result. I did it again using a 4gb USB flash drive. Same result: Two partitions, no data erased after formatting on the PC (Windows 7). I am glad to have discovered these idiosyncrasies before performing the same task on one of my external hard drives or relying on a my USB ports for a chain of printers. Before someone replies with an obvious and simple explanation resulting from something I am doing wrong I would like to get in first. I appreciate Apple has set the benchmark in terms of style but it is these 'little things' that take away the gloss. When will they learn that, in a world of practical necessity, form is nothing without function? I like the style but I need the substance. Regards, Mark Stegman

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Wide gamut iMacs
by Ben Goren 17 Oct '15

17 Oct '15

I'm sure I'm not the only one on this list who's seen Apple's announcement of a refresh of the iMac line, including "P3 color gamut" displays. I had to look that one up. The blue primary is basically the same as Adobe RGB. P3's red primary is significantly more saturated than Adobe RGB's, but Adobe RGB's green primary is significantly more saturated than P3's. Details start about halfway down the page here: http://dot-color.com/category/color-gamut-standards/ Is there anybody here who's had a chance to get some hands-on experience with one (including spectrophotometric measurements) and is at liberty to share such an experience? The marketing materials definitely hit all the right notes, but that's marketing's job.... Also, off-topic...does anybody know if the iMacs would take 16 Gbyte memory modules when such become available? 32 Gbytes is very good, but I can imagine someday wanting 64, and wanting it before the rest of the hardware is obsolete.... b&

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i1Pro2 Problems
by Martin Orpen 06 Oct '15

06 Oct '15

Anybody having problems with their ageing i1Pro2 devices? I’ve got two here that can no longer be used for certifying proofs because they can no longer read the 100 C patch correctly :( The first is a 2012 purchase that has done 5292 strip reads and the lamp lit for 17,771 seconds. The second a 2014 purchase that has done 2070 strip reads and the lamp lit for 5,868 seconds. Another 2014 purchase that has only done 230 strip reads will pass the proofs. So will a 2011 i1 Pro that has done 9,994 strip reads and 31,981 seconds of lamp use! All pass the i1 Diagnostics tests. The proofers are calibrated using an ILS30 but when we are running at high output we can’t afford to waste time pausing and auto reading each proof — so have to switch to the i1s. It looks to me that the older the i1Pro2 gets the worse it gets at measuring 100% cyan — there are no problems with any other patches. Comparing the good and bad devices in ArgyllColorMeter shows that the spectral curve for cyan is an identical shape but offset slightly. Annoying that it only takes 15 months of relatively light use before the these devices become pre-press bricks :( -- Martin Orpen Idea Digital Imaging Ltd

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Re: CMY profiles with i1Profiler
by Mike Strickler 05 Oct '15

05 Oct '15

Bill, Terry: If I understand Terry's aims correctly, he's hoping to reduce the number of total patches to ease the burden of repeated profiling of large numbers of devices, rather than a scenario that Bill might encounter on one of his flexo presses--a configuration where black is missing and only CMY is present, which would best be handled by a CMY profile. In Terry's case (again, if my assumption is correct), there are other possibilities: One might be simply using a smaller CMYK patch set. True, the distribution of colors might not be theoretically ideal, but suprsingly good profiles can be made from just a few hundred patches, more than good enough for unstable digital presses, for instance. (If they are not unstable they will not need frequent reprofiling, which is the presumed need for the abbreviated chart to begin with). There is still another approach offered by prgrams that optimize or reprofile using very small charts., after having made a good initial profile. These would include the EFI Fiery Color Profiler Suite (for Fiery-controlled press), CGS's front end for certain digital presses, also with iterative optimization, and ColorLogic's standalone Reprofiler app, which uses some smart math to reprofile with a small chart. I've tested with 88 patches and the results are very good indeed. (Disclosure: I have business reationships with EFI and ColorLogic.) Mike Strickler MSP Graphic Services > Message: 1 > Date: Thu, 01 Oct 2015 13:39:41 -0700 > From: William Whitfield <billw(a)mlode.com> > To: ColorSync-users <colorsync-users(a)lists.apple.com> > Subject: Re: CMY profiles with i1Profiler > Message-ID: <2BAF418B-1AEE-43E3-9A6A-5B3F76AF45ED(a)mlode.com> > Content-Type: text/plain; charset=windows-1252 > > Greetings, > > A few months ago I created a “No K” profile by doing just what Liane suggested and we are presently using it on our HP Indigo. Except for dark colors is is hard to tell the difference on the printed pieces between using the 4 color and the 3 color profile workflow. > > FYI - I did a bit of experimentation yesterday and tried to make a 4 color profile by first deleting the K channel from the reference file - received error while profile was being made. I then tried leaving the K channel in and made all K values zero - once again received error. Took the time to replace any value in the K channel with a 1% and was able to build a profile from the measurement file without error. So as Terry said it appears that iProfiler needs some values in the K channel. > > I have, in Photoshop, used both my 4 color and 3 color profile to convert an RGB test target and both seem to produce values very close to the original RGB lab values - with only the darker colors taking a bit of a hit. > > -Bill- > > > > > ------------------------------ > > _______________________________________________ > Colorsync-users mailing list > Colorsync-users(a)lists.apple.com > https://lists.apple.com/mailman/listinfo/colorsync-users > > End of Colorsync-users Digest, Vol 12, Issue 127 > ************************************************

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Re: CMY profiles with i1Profiler
by William Whitfield 01 Oct '15

01 Oct '15

Greetings, A few months ago I created a “No K” profile by doing just what Liane suggested and we are presently using it on our HP Indigo. Except for dark colors is is hard to tell the difference on the printed pieces between using the 4 color and the 3 color profile workflow. FYI - I did a bit of experimentation yesterday and tried to make a 4 color profile by first deleting the K channel from the reference file - received error while profile was being made. I then tried leaving the K channel in and made all K values zero - once again received error. Took the time to replace any value in the K channel with a 1% and was able to build a profile from the measurement file without error. So as Terry said it appears that iProfiler needs some values in the K channel. I have, in Photoshop, used both my 4 color and 3 color profile to convert an RGB test target and both seem to produce values very close to the original RGB lab values - with only the darker colors taking a bit of a hit. -Bill-

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Re: CMY profiles with i1Profiler
by Mike Strickler 01 Oct '15

01 Oct '15

I1P has no problem with custom charts per se; I believe Terry's difficulty was in getting it to compute a profile from a data set that either lacks any CMY+K patches or has too few to satisfy i1P', which evidently errors out. I1P is not a true n-color solution; it wants to see a full CMYK set. (I have not tried making an RGB profile with it using C,M, and Y--maybe that also causes an error). Other profilimg applications have been designed to make profiles with any number or combination of colors and don't reqiure CMYK at all. Profilemaker Packaging was one. ColorLogic CoPrA (all versions) can make CMY profiles. It also should have no trouble using a chart with fewer-than-usual CMY+K patches. Mike Mike Strickler MSP Graphic Services > Message: 1 > Date: Tue, 29 Sep 2015 23:42:48 +0100 > From: Martin Orpen <martin(a)idea-digital.com> > To: "'colorsync-users?lists.apple.com' List" > <colorsync-users(a)lists.apple.com> > Subject: Re: CMY profiles with i1Profiler > Message-ID: <077E6415-6FE8-4FA0-B35E-94ECC2E65C8E(a)idea-digital.com> > Content-Type: text/plain; charset=utf-8 > > >> On 29 Sep 2015, at 16:01, Terence Wyse <wyseconsul(a)mac.com> wrote: >> >> Unfortunately, i1Profiler needs to see some CMYK+K patches or it errors out. Tried adding a few K-only patches but that didn’t help. > > > Argyll’s targen & printtarg can generate CMY-only test data and charts in seconds. > > I know that you (really annoyingly) can’t import custom charts for scanner profiling, but surely i1Profiler must be able to import custom charts for printer profiling? > > -- > Martin Orpen > Idea Digital Imaging Ltd

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