On-Screen Proofing and Rendering Intent

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Level 1

11 points

On-Screen Proofing and Rendering Intent

Is there any way to adjust the rendering intent (i.e. perceptual, relative colorimetric) for on-screen proofing? Any insight would be appreciated.

Thanks, Tom

MacPro, Mac OS X (10.6.5), Canon Pixma Pro9500 MkII

Posted on Dec 17, 2010 3:33 PM

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Answer 1

Dec 19, 2010 8:45 AM in response to tomnorth

I believe you need to be looking at the +Color Sync Utility+ to address this.

+Color Sync Utility+ is Apples Color Management Module.

Message was edited by: Frank Caggiano

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Answer 2

tomnorth Author

Level 1

11 points

Dec 19, 2010 9:29 AM in response to Frank Caggiano

I tried that but couldn't figure out how to change the rendering intent noted within Color Sync. I don't want to permanently change the rendering intent. I'd rather be able to toggle back and forth with on-screen proofing on so that I can judge the affect of different rendering intents.

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Answer 3

Dec 19, 2010 10:52 AM in response to tomnorth

As I understand it rendering intent is a function of the CMM on OSX, Color Sync Utility in this case. I don't believe Aperture manipulates the rendering intent.

Not sure if there is a discussion group dedicated to the Color Sync Utility but you may want to poke around in the OS X lists to see if there might be another place to ask your question.

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Answer 4

Dec 30, 2010 1:29 PM in response to Frank Caggiano

It can be done. Take a copy of the profile. Hexedit it and change the 4 bytes at hex address 40 (address 64 in decimal) inside the header.

They will be

00 00 00 00 for perceptual
00 00 00 01 for relative colormetric
00 00 00 02 for saturation
00 00 00 03 for icc absolute

you can use any old hex editor you like.

Cheers

George

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Answer 5

tomnorth Author

Level 1

11 points

Dec 30, 2010 2:26 PM in response to George Harker

Thanks for the helpful suggestion. Perhaps my hex editing skills aren't up to snuff. I downloaded a free hex editor and edited what I thought was address 40 as you suggested. For some reason though, I couldn't get Aperture to see the profile. I closed Aperture, reopened it, and still the profile wasn't showing among the choices for on-screen proofing. Oh well.

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Answer 6

Dec 30, 2010 9:25 PM in response to tomnorth

Ah, you probably need to then edit the profile in colorsync utility and change the string names (Localized description strings). Make sure it's in your ~/Library/Colorsync/Profiles folder and restart aperture.

I did this to allow proofing of relative intent print profiles

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