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Proper Lighting Conditions
Thanks to GTI, this PDF shows some common specifications that are included in the ISO 3664:2000 guidelines.

Thursday December 18, 2003
by GTI Graphic Technology, inc.

A lot of discussion on proper lighting and environmental conditions in the digital darkroom have been discussed. Here is a PDF from GTI, the makers of excellent light boxes. It does provide some information from the ISO 3664:2000 standard.

Weekly Chatter:Need for Correct Exposure in RAW
Wednesday November 26, 2003
by weekly chatter

Each and every week, Imaging Revue offers non-members a tantalizing taste of the information available within our forums. Make sure to check out the entire list!

Soft Proof Tutorial by John Paul Caponigro
Monday November 24, 2003
by John Paul Caponigro

John Paul Caponigro walks the reader through the processes of soft proofing images in Photoshop in this elegant and useful PDF excerpt from his book "Photoshop Master Class". orders placed through John Paul at info@johnpaulcaponigroarts.com receive a free PDF Guide to Getting Good Color.

Weekly Chatter:Photoshop CS - Print with Preview settings
Thursday November 20, 2003
by Imaging Revue Experts and Members

Each and every week, Imaging Revue offers non-members a tantalizing taste of the information available within our forums. Make sure to check out the entire list!

Greg Gorman's B&W; conversion technique
Tuesday November 18, 2003
by Greg Gorman

Greg Gorman shares with the Imaging Revue subscribers, a technique that finally allows him to shoot color and still get the B&W; effect he desires. Designed by his retoucher Rob Carr, this step-by-step tutorial will show you a great new way to not only convert color to B&W; but add color toning as well! Please refer to the forum thread that got this discussion started.

...see more articles(many more!)

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Color Management/WorkFlow > Hardware and Software > ImagePrint's Magenta Cast in Blues

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AuthorSubject: ImagePrint's Magenta Cast in Blues   [Go to Bottom of Page]
Eddie Gilbert
Posted on Mon Oct 6, 2003 10:28 PM

At Andrew's suggestion, I joined Imaging Revue as a paying member because meaningful information on this topic seemed impossible to obtain from any other source, so this is both a plea for genuine help and a chance for me to see if I'm going to get my money's worth out of this subscription.

First, just a touch of background info. I have been working with digital imaging, digital printing, and color management for a long time now -- point being, I'm not an uninformed novice, and I'm not making silly mistakes.

Ever since "upgrading" to ImagePrint 5.5 for my 7600 (UC w/MB), all color prints are exhibiting a significant magenta cast to "blue" colors, with the degree of the cast depending upon the shade of blue. Sky blue (a memory color, no less), are slightly purple. Deeper blue, more purple.

Even worse, this magenta cast is NOT displayed when viewing the source image in Photoshop while soft proofing against the target profile, so it cannot be predicted or mitigated effectively.

I have discussed this until I'm blue in the face with John from ColorByte. I have made certain to use their "proper" profile for the target lighting conditions [I have much more I can say here to validate my case, but for the moment, until challenged, I will try to keep this post to the point]. I have sent John a "care package" to thoroughly document my case and findings. For my dollars and patience, I get that I must just be using their product improperly. Until recently, I was told that they were working on a set of 5.5/5.6 replacement profiles that would solve the problem, but now I am told that any such new profiles only "handle out of gamut blues" better than the prior versions, but that they do not specifically aim to eradicate this reported "magenta cast in blue colors" issue.

I am not alone. For weeks now it seems every day ImagePrint users have been posting articles to the Yahoo ImagePrint user group, ranging from confused questions to downright pissed off that they, too, have paid a lot of money for the "ultimate printing solution", and cannot make use of the product for color printing because of this nagging issue.

There is much about ImagePrint 5.5 that is good. The dither pattern is significantly improved over 5.0. Grayscale printing using their grayscale profiles remains unbeatable. Image detail is incredible. Image color, overall, is very believable. Just don't have any significant areas of blue in your image, meaning no skies, no water, no blue flowers, etc.

So, dear Imaging Revue experts -- what gives? Please offer some genuine help by (1) acknowledging that this is a real problem rather than supporting Colorbyte and pretending this issue does not exist; (2) explaining what is going on, if you know; (3) offering valid solutions, or at least letting us know why there are no solutions available and what you yourselves are doing/using to accomplish 100% satisfactory color and grayscale images from your 7600's.

Many thanks,
/eddie

PS: Prior to moving to IP 5.5, I have created my own profiles using Monaco Proof and a DTP-41 with reasonable success. Display profiling of my 23" HD Cinema Display is done with an Eye-One and Eye-One Match. Print evaluation compared to the calibrated and profiled display is done using a GTI SoftView, with prints also evaluated standalone under other mixed lighting conditions. Within this overall framework, I had been achieving a high degree of final print to Photoshop soft proof matching, good color, and no such magenta casts or other decided color shifts in my prints. Comparing prints made with IP 5.5 and the CB-provided profiles to prior prints made with IP 5.0 and my own profiles, it is clear that in terms of overall print quality the IP 5.5 prints have a smoother dithering pattern and decidely more believable color overall, but at the expense of blues having this noticeable magenta color shift in print, but not in the Photoshop soft proof. I can try regenerating all my own profiles for 5.5, but visual print observations have me believing John from Colorbyte that any such profiles I can create with my modest tools will not be as accurate or deliver the color quality that profiles they can generate and deliver -- in general I am inclined to agree based upon my own comparisons, but this issue of blues shifting magenta is too significant to overlook, and Colorbyte is not trying to help.


... this thread contains expert advice from Andrew Rodney.




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