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my 1st cast on Lacie 324/CS4 RGB to CMYK

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Old 08-19-2009, 07:35 PM
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TommyO TommyO is offline
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Re: my 1st cast on Lacie 324/CS4 RGB to

Thanks for the feedback.

Originally Posted by nadaman View Post
Confirmed with Apple that my iMac does support dual monitors - mirrored and extended desktop.
This just means the graphic card has two outputs, which is true for 98% of the cards today. So, unfortunately, it does not imply the GPU supports dual LUT's, which is required for dual calibrations.

Originally Posted by nadaman View Post
If I want to replace the graphic card, I must buy a new mother board as well. They are attached in iMac.
I wondered about this, and was not quite sure. Most applications for the GeForce 8800M GTS are mobile, which raised the question of what was inside the iMac. (I've never opened one up.) Thanks for letting us know this as well.

This also begs the question of whether or not you can switch the primary display. Not very likely in this configuration. So, Apple must answer the question... "how do you calibrate the secondary display on an iMac with this GPU ?"
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Old 08-22-2009, 12:54 PM
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ReneDamkot ReneDamkot is offline
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Re: my 1st cast on Lacie 324/CS4 RGB to

Late to the party (came across this thread Googling for something else).

The first screenshots (CS3 and CS4 on the LaCie) have the iMac monitor profile embedded (10.06.09-5000k-22-110cd-PE-imac.icc) instead of the LaCie profile.

So that's not correct right there.

I suspect PSCS4 sees a different monitor profile from the rest of the OS and CS3 (had a similar problem once: Photoshop used the proper profile, OSX didn't: Turned out to be some kind of permissions issue)

Check what monitor profile both versions PS are looking in the PS color prefs here:

On a side note: I think (but am not sure) iMacs are similar to MBPs: Only one of two screens can be calibrated. The last screen calibrated will be accurate.
Would be fairly easy to check by measuring the accuracy of the profiles I think. (Should also be visible while calibrating, as the data is loaded to the LUT, only one screen should change.)
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Old 08-24-2009, 10:47 AM
nadaman nadaman is offline
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Re: my 1st cast on Lacie 324/CS4 RGB to

I turned off OpenGL in CS4 preferences - performance and CS3 & CS4
both behave identically in RGB & CMYK. LaCie red cast in CMYK is gone.
"Enable OpenGL Drawing" in preferences is new in CS4.

MarkZebra was right. Wondering if you could explain.

My apologies for not trying this (simple solution) out sooner but I had a deadline and choose to go with what I knew to work to get me by in the short term.
I have spoken to Apple again to confirm what the first product specialist said from post above.
I have not heard back from Nvidia or Adobe.

I would like to thank MarkZebra, TommyO and the others that contributed , I couldn't have done it without you as I have limited knowledge about all this stuff.

I will post results from my conversation with Apple later today as I have time now.
Again thanks all for your help.
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Old 08-24-2009, 01:07 PM
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Markzebra Markzebra is offline
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Re: my 1st cast on Lacie 324/CS4 RGB to

Ok then we finally got there. Its to do with your graphics card having different colour rendering to Photoshops inbuilt. If you click on Open GL settings -Advanced there is a setting for 'Gamma Corrected'. You may find that turning open GL ON again and playing with this setting might help you to use Photoshops new Open GL settings without problems.

Photoshop CS4 has two ways of renderigng on screen - one is using your graphics card, directly using Open GL - and the other is built into Photoshops code, just as it always was in previous versions

Last edited by Markzebra; 08-24-2009 at 01:14 PM.
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Old 08-24-2009, 07:53 PM
nadaman nadaman is offline
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Re: my 1st cast on Lacie 324/CS4 RGB to

To TommyO:
I spoke with Apple a second time to find out more about dual monitor support.
Here's what was said,
- my imac has full dual monitor support with 2 LUT's that treat both displays equally.
- rearranging the displays is easily done in display preferences, under arrangement.
can also drag menu bar to any display. see jpeg of arrangement talk window.
- calibration profiles are also supported for each display with the 2 LUT's.
- when I asked if I could use 1 calibrated profile for both monitors he said it was
highly unlikely because even though both would be LCD displays, they are made
differently by each manufacturer. Like comparing lenses. Both may be made of
cut glass placed in a barrel but their performance could be quite different based on
the glass used, coatings, and design.
- this rep said the motherboard and video card were separate. He was looking in the spec
manual. But one could run into a problem with the connection between the two.
A newer GPU may not have the same connector to allow it to be hooked to an older
motherboard, which may very well lead to the motherboard being replaced as well.
The work would have to be done by an Apple trained service provider to keep the
warranty valid.
- He also said there would be no advantage to having 2 GPU's - one for each display - for
still images. Dual cards could help in graphics acceleration (gamers). But only in the highest quality
monitor one may notice only a slightest difference that he felt didn't justify the cost of the second
Hope this answers your questions. Thanks for all your help and information. I now know a lot more.
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File Type: png Picture 1.png (32.0 KB, 4 views)

Last edited by nadaman; 08-24-2009 at 08:07 PM. Reason: add attachment
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Old 08-24-2009, 07:58 PM
nadaman nadaman is offline
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Re: my 1st cast on Lacie 324/CS4 RGB to

Thanks Mark, I'll have to give it a try. cheers.
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Old 08-24-2009, 08:14 PM
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TommyO TommyO is offline
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Re: my 1st cast on Lacie 324/CS4 RGB to

Great !
Nice to know the resolution was that easy. Many OpenGL issues show up as more complicated or obvious. Interesting this one was very subtle. One day we may know more about why; or they'll build proper support into all the graphic adapters, so it won't matter.
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Old 03-10-2010, 01:31 PM
warze li warze li is offline
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Re: my 1st cast on Lacie 324/CS4 RGB to

…dont thrust in your display to much! …this "magenta" issue is very common in print world…u need tht ur "print" provider gives u an indicative profile…(i most use "ISOnewspaper/coated FOGRA39 and modified spaces", but tht is given me from the printprovider) …for better prints… (and i still correct skintones allways, separatly with a "quickmask"… and lot more… put out tht cyan from red/yellows…in commercial print skindarkness st looks "better" if you replace cyan with black, …cleaning out most of colors… so they more "understandable"…blacks need particular attention…neutralizing…and…working much with "blur" and "unsharp mask"…always look your prints are at right dpi when printed …ask how they print…try visit!…)…
…all tht trying to not alter the image to much from his origin…and doing good predictable image preparation for specific print…u know u can do it…
…u need request a color proof from your provider to…so you can REcorrect where u wrong «and work "with" tht profile…instead suffer from misstakes…a proof not costs a wrong print! …then u have better results!……but im still learning…
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