January 2017 - colorsync-users

Lightbox Temp for Ecommerce
by Jeff Nova 27 Jan '17

27 Jan '17

Hi there, In ecommerce, though there is no paper white to match, we still must use light boxes to color correct to product samples, among other things. My company uses 5000K dimmable light boxes (and ambient lighting), while our monitors are calibrated to D65 (since we correct in sRGB or Adobe RGB). I just met with a client who changed their light boxes to be at 6500K for ecommerce and was surprised. I wanted to check in with the ColorSync community and hear your opinion on best practice. Thanks in advance for your time and consideration. Very best, Jeff -- Jeff NovaChief Executive OfficerColorhythm jnova(a)colorhythm.comMain: +1 415-399-9921Mobile: +1 510-710-9590Fax: +1 415-399-9928 1015 Battery Street, Suite CSan Francisco CA 94111http://colorhythm.com Please consider our environmentbefore printing this email Colorhythm is a certified Green Business:This electronic mail and the documents accompanying it are considered trade secret, confidential and/or proprietary by Colorhythm LLC. This information is intended for use by the individual or entity to whom this e-mail is addressed. If you are not the intended recipient, be aware that any disclosure, copying, distribution or use of the contents of this information is prohibited.

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eye-one iSis not seen by i1Profiler
by david＠lenzart.us 26 Jan '17

26 Jan '17

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RE: Devicelink Profile to Convert from Prophoto to sRGB
by Roger Breton 24 Jan '17

24 Jan '17

Muito obrigado :-) / Roger -----Original Message----- From: Lorenzo Ridolfi [mailto:lorenzo@mail.com] Sent: Tuesday, January 24, 2017 4:27 PM To: ColorSync List <colorsync-users(a)lists.apple.com> Cc: Roger Breton <graxx(a)videotron.ca> Subject: Re: Devicelink Profile to Convert from Prophoto to sRGB Following a suggestion from Roger (thank you!), I also made a profile to convert between ProPhoto and Adobe RGB. Here is the link: goo.gl/DlQjZP Best Regards, Lorenzo

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RE: Devicelink Profile to Convert from Prophoto to sRGB
by Roger Breton 24 Jan '17

24 Jan '17

Lorenzo, Is your thesis "published" anywhere? Best / Roger -----Original Message----- From: colorsync-users-bounces+graxx=videotron.ca(a)lists.apple.com [mailto:colorsync-users-bounces+graxx=videotron.ca@lists.apple.com] On Behalf Of Lorenzo Ridolfi Sent: Monday, January 23, 2017 8:34 AM To: ColorSync List <colorsync-users(a)lists.apple.com> Subject: Devicelink Profile to Convert from Prophoto to sRGB Hi, I developed a device link profile to convert from ProPhoto RGB to sRGB perceptually. I opted for a device link profile because ProPhoto has colors with CIELAB a and b coordinates that exceeds the range supported by ICC PCS. This profile was built using a new perceptual color space I developed in my thesis and can be downloaded freely at http://goo.gl/HI82P8 <http://goo.gl/HI82P8>. Any comments or feedback are welcome! Thank you, Lorenzo _______________________________________________ Do not post admin requests to the list. They will be ignored. Colorsync-users mailing list (Colorsync-users(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/colorsync-users/graxx%40videotron.ca This email sent to graxx(a)videotron.ca

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ImageMagick Mogrify: Apply vs. Convert to Profile
by Rick Gordon 23 Jan '17

23 Jan '17

I have installed ImageMagick on a Linux server hosting a WordPress site. If I run the command mogrify -profile PATH/TO/sRGB.icm MY_TARGET_IMAGE ...will that apply the profile or convert the image to that profile? The docs seem to be confusing on this issue. The top of http://www.imagemagick.org/script/mogrify.php says: "Use the mogrify program to resize an image, blur, crop, despeckle, dither, draw on, flip, join, re-sample, and much more. This tool is similar to convert except that the original image file is overwritten (unless you change the file suffix with the -format option) with any changes you request." …which makes me think conversion. But http://www.imagemagick.org/script/command-line-options.php#profile says: "Using -profile filename adds an ICM (ICC color management), IPTC (newswire information), or a generic profile to the image." ...which suggests assignment/application. But then, this, from the same page, a couple paragraphs down: "It is important to note that results may depend on whether or not the original image already has an included profile. Also, keep in mind that -profile is an "operator" (as opposed to a "setting") and therefore a conversion is made each time it is encountered, in order, in the command-line." (But it's unclear to me if this is alluding to the convrt command, but not mogrify.) Then there's this this, from http://www.imagemagick.org/script/mogrify.php, down at the -profile listing: -profile filename add, delete, or apply an image profile It does SEEM like it's doing an apply action, but I'm not 100% sure. Color me confused. I'm looking for a way to apply an sRGB profile to untagged images, via the command line, in Linux. And I apparently can't install Argyll, since I don't have admin privileges: It's a shared server. I did succeed in doing a local install of ImageMagick (also allegedly requiring admin privileges), via instructions here <http://www.photopost.com/magicknoroot-php.html>, but using current versions. ___________________________________________ RICK GORDON EMERALD VALLEY GRAPHICS AND CONSULTING ___________________________________________ WWW: http://www.shelterpub.com

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Devicelink Profile to Convert from Prophoto to sRGB
by Lorenzo Ridolfi 23 Jan '17

23 Jan '17

Hi, I developed a device link profile to convert from ProPhoto RGB to sRGB perceptually. I opted for a device link profile because ProPhoto has colors with CIELAB a and b coordinates that exceeds the range supported by ICC PCS. This profile was built using a new perceptual color space I developed in my thesis and can be downloaded freely at http://goo.gl/HI82P8 <http://goo.gl/HI82P8>. Any comments or feedback are welcome! Thank you, Lorenzo

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RE: ImageMagick Mogrify: Apply vs. Convert to Profile
by Roger Breton 21 Jan '17

21 Jan '17

Does ImageMagic run in a .NET (the Dark Side of the Force...) environment? / Roger -----Original Message----- From: colorsync-users-bounces+graxx=videotron.ca(a)lists.apple.com [mailto:colorsync-users-bounces+graxx=videotron.ca@lists.apple.com] On Behalf Of John Gnaegy Sent: Friday, January 20, 2017 6:36 PM To: ColorSync List <colorsync-users(a)lists.apple.com> Subject: Re: ImageMagick Mogrify: Apply vs. Convert to Profile There are two common ways to do something to an image with a profile, embed vs match. Embed adds the profile to the image metadata without changing the pixel data. Match changes the pixel data and also embeds the profile. After doing an operation like this, you can determine which was done (match or embed) by deleting the profile from the image and viewing it, assuming you have a way to actually delete the profile. _______________________________________________ Do not post admin requests to the list. They will be ignored. Colorsync-users mailing list (Colorsync-users(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/colorsync-users/graxx%40videotron.ca This email sent to graxx(a)videotron.ca

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Re: ImageMagick Mogrify: Apply vs. Convert to Profile
by Rick Gordon 20 Jan '17

20 Jan '17

It turns out that my best solution was to install exiftool, which can embed a profile losslessly, and does not change the mod date either, using this command: exiftool "-icc_profile<=/PATH/TO/sRGB.icm" -overwrite_original TARGET_FILE --- The answer I got in the forum <http://www.imagemagick.org/discourse-server/viewtopic.php?f=1&t=31264> was this: > > Both mogrify and convert will add the profile to the image or convert from an existing profile to the new one. The image will be read, a new profile added and then the image with the profile will be written to the output, which could be the same as the input. But note, then image must be read. You cannot just include a profile with an image without reading the image first in IM. Perhaps some other tool would do this. If the image is JPG (lossy compression), then it will lose some quality being read and written again. Other formats that are not lossy compressed will show no affect in quality. But you must allow some time for reading and writing the image. For only one image, use convert since it is more flexible than mogrify. For many images in a folder that all need the profile, you can use mogrify to process all the images in a folder using a wild card or you can write a script loop over all the images in the folder and use convert once for each image. The syntax for each is different. For mogrify, see http://www.imagemagick.org/Usage/basics/#mogrify << Rick Gordon -------------------- On 1/19/17, 6:44 PM Jeff Nova said: > I recommend asking on the IM discourse server. You'll likely get the > definitive response quickly. I've only used this with the convert > utility, never mogrify. I also always compile with LCMS2 and am not > sure if that matters. They will know. Good luck! Please share your > findings here! > > Best, > Jeff ___________________________________________ RICK GORDON EMERALD VALLEY GRAPHICS AND CONSULTING ___________________________________________ WWW: http://www.shelterpub.com

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Bluebeam = No Color Management?
by Randy Zaucha 10 Jan '17

10 Jan '17

If all you had was the Bluebeam application, could you correctly print your profile targets using that application? When I tested it years ago, what came out was the same as what went in profile-wise. Could we assume that the "no profile" target charts would remain at "no profile" and get a print that could make a decent profile? Just wondering if anybody had tried it. Randy ZauchaARC Document SolutionsFremont, Ca

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