April 2015 - colorsync-users

Re: Colorsync-users Digest, Vol 12, Issue 49
by customusa＠aol.com 21 Apr '15

21 Apr '15

Please take Norman Shaifer off this list as soon as possible. -----Original Message----- From: colorsync-users-request <colorsync-users-request(a)lists.apple.com> To: colorsync-users <colorsync-users(a)lists.apple.com> Sent: Mon, Apr 6, 2015 3:08 pm Subject: Colorsync-users Digest, Vol 12, Issue 49 Send Colorsync-users mailing list submissions to colorsync-users(a)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(a)lists.apple.com You can reach the person managing the list at colorsync-users-owner(a)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. Substrate Relativity Calculator (Mike Stewart) ---------------------------------------------------------------------- Message: 1 Date: Mon, 06 Apr 2015 13:36:30 -0500 From: Mike Stewart <mstewart(a)embassygraphics.com> To: colorsync-users <colorsync-users(a)lists.apple.com> Subject: Substrate Relativity Calculator Message-ID: <CAFB95otBwyTxN3fbwkGiCAxMwYMHKRWW5BG+ur-7DcU8NJixYA(a)mail.gmail.com> Content-Type: text/plain; charset=UTF-8 Does anyone have the "Coles Notes" version of how to work with this. I have to use Open Office. I also want to somehow load Fogra47 info into it; then change the white point of the Fogra 47 to create a different dataset. Me and spreadsheets get along like oil and water and I shudder if I have to use this method moving forward when dealing with paper white issues. The "How To" guide tells me nothing (at least I'm getting nothing out of it that makes sense). Any help would be greatly appreciated. Mike Stewart ------------------------------ _______________________________________________ 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 49 ***********************************************

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Epson Printer Driver - sRGB - ARGB
by matthew＠matthewwardphotography.com 17 Apr '15

17 Apr '15

Dear all I have struggled to understand a setting in the Epson printer driver for many years. (Yes my life is that boring). It seems to be a fairly universal setting (R2400, 3880, 4800) When using Printer Manages Colors > Print Settings > Color Settings, there is the option to select EPSON Standard (sRGB) or Adobe RGB (Along with Vivid and charts and Graphs). This setting does seem to have a slight effect on the printed image. An ARGB image seems to print slightly more accurately when the setting is Adobe RGB (Using the Pixl test image). Does anyone know why it is there and what it is for? The vivid etc suggests to me that it is some kind of rendering intent, if so why is it called sRGB etc and why have 2 rendering intents in the workflow (The rendering intents are not greyed out in the Photoshop Printer Window)? Best Matthew __________________________________ Matthew Ward Photography matthew(a)matthewwardphotography.com www.matthewwardphotography.com ww.imagebasedlighting.co.uk __________________________________

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Comparing L*a*b* measurement scales: Photoshop vs Xrite
by Mike Pucher 13 Apr '15

13 Apr '15

I have a set of L*a*b* measurements of color charts that I created with a i1Pro2 spectrophotometer. The Xrite software exports L*a*b* values on a scale of L*:0-100 and *a*b*: -100 to +100*. I've written a script for Photoshop to automate the calculation of specific metrics of captures of those charts, but there's one snag: Photoshop displays L*a*b* values on a scale of L*:0-100 and *a*b*: -128 to +127*. I assume, but I haven't been able to find confirmation, that it is a mathematically linear conversion (mapping) from the *-100 to +100 a*b* scale* to the *-128 to +127 a*b* scale.* Can anyone verify this? Or point me in the direction of the proper way to map the values between the two scales? Thanks, Mike -- *Mike Pucher* *Sr. Image Capture Specialist* *Animation Research Library* desk: 818.544.4185 (8223-4185)

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Rejected...
by Martin Orpen 10 Apr '15

10 Apr '15

One month and one week after posting to the list: > On 9 Apr 2015, at 22:41, colorsync-users-owner(a)lists.apple.com wrote:Your request to the Colorsync-users mailing list > > Posting of your message titled "K generation in > GRACoL2006_Coated1v2" > > has been rejected by the list moderator. The moderator gave the > following reason for rejecting your request: > > "Your message was too big; please trim it to less than 48 KB in size." > > Any questions or comments should be directed to the list administrator > at: > > colorsync-users-owner(a)lists.apple.com :-) -- Martin Orpen Idea Digital Imaging Ltd

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Substrate Relativity Calculator
by Mike Stewart 09 Apr '15

09 Apr '15

Does anyone have the "Coles Notes" version of how to work with this. I have to use Open Office. I also want to somehow load Fogra47 info into it; then change the white point of the Fogra 47 to create a different dataset. Me and spreadsheets get along like oil and water and I shudder if I have to use this method moving forward when dealing with paper white issues. The "How To" guide tells me nothing (at least I'm getting nothing out of it that makes sense). Any help would be greatly appreciated. Mike Stewart

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Inks
by Mike Stewart 07 Apr '15

07 Apr '15

Another question has rolled on by. Has anyone heard of Chroma Centric Wide Gamut Inks? Looks to me like another version of Hexachrome or similar. Mike Stewart

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Re: Colorsync-users Digest, Vol 12, Issue 46
by Louis Dery 04 Apr '15

04 Apr '15

The cmyk numbers from Pantone ColorBridge are not simulating any "standard profiles" found with Adobe applications. I've made several test since few years, and never found a cmyk profile close to what Pantone makes thos cmyk values accurate. You are better to use Pantone colormanager to convert Pantone solids to your KNOWN cmyk color sapce. Louis Dery Color911.com Transmis via mon iPad > On 2015-03-31, at 15:12, colorsync-users-request(a)lists.apple.com wrote: > > > Mark, > > There isn't a "right" RGB or CMYK. The RGB and CMYK equivalents are going to depend on which RGB and which CMYK, and to compound things, my understanding is that while the RGB numbers in the bridge book relate to sRGB, the CMYK numbers are some CMYK space Pantone created and has never released, so they don't relate completely to any commonly used CMYK space. (Although from playing with it over the years, the space seems fairly close to SWOP to me.) > > Keep in mind though that there are plenty of Pantone colors that are out of the gamut of sRGB, so not all the RGB numbers, even using sRGB, are going to be equivalents to the L*a*b* value of all colors. > > Best quick way to get the L*a*b* value of any PMS is just to select color books in the picker, the pick that color. It'll give you the value right there. > > > Mike Adams > Correct Color

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i1Profiler Spectral Device Link Profiler
by Roger Breton 02 Apr '15

02 Apr '15

I'm interested in experimenting with the new "Spectral" type Device Link Profiles offered in i1Profiler. >From X-Rite's documentation, this feature requires that both the Source and Destination device profiles have spectral data. Logical. Yet, when I try to build a spectral DVL out of a pair device profiles, freshly created in i1Profiler, from the provided "SWOP 2006 Coated 3.mxf" dataset, that only include XYZ / Lab colorimetric data, I am surprised not to get any kind of error messages to the effect that there is *no* spectral data to be found in the selected device profiles pair? I must be missing something grossly obvious :( / Roger

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