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custom CMYK inks in Photoshop: set relative to D65 ?

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custom CMYK inks in Photoshop: set relative to D65 ?

Subject: custom CMYK inks in Photoshop: set relative to D65 ?
From: <email@hidden>
Date: Wed, 14 Dec 2005 14:12:03 -0500

To all,

While making a check, I looked at the ink coordinates for SWOP coated in Photoshop. They can be shown in either xyY or L*a*b*, which is selected by a small checkbox in the dialog.

I always assumed that, Photoshop always using the ICC PCS, and especially when selecting inks for CMYK profiles, this would be defined in D50. However, when converting from xyY to L*a*b* and vice-versa, my calculation match Photoshop only when I used D65, not D50.

Is there a sort of default illuminant PS uses to handle these values? and which is automatically set set using my display profile or something else?

I could not find any doc on this.

Thanks,

Danny Pascale

email@hidden
www.BabelColor.com
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