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I have a PDF target job containing a few hundred patches specified in the Lab colour space. I can import this into Photoshop specifying the ‘Lab Color’ mode and when I look at the Lab values of each patch they are exactly as the PDF says.
The problem comes when I choose to convert the image to a profile (any profile) because Photoshop appears to do no chromatic adaptation during the conversion. It is as though D50 is assumed, since that is the ICC standard. I can change X and Z values of the white point in the PDF to any numbers and the conversion is always unchanged. If the Y value is changed to any number other than 1, the Lab elements are not rendered in Photoshop.
Is there any way I persuade Photoshop to honour the chromatic adaptation implied by non-D50 white points? I am using CS2 on Windows.
Thankyou for any help.
John Jefferies
The problem comes when I choose to convert the image to a profile (any profile) because Photoshop appears to do no chromatic adaptation during the conversion. It is as though D50 is assumed, since that is the ICC standard. I can change X and Z values of the white point in the PDF to any numbers and the conversion is always unchanged. If the Y value is changed to any number other than 1, the Lab elements are not rendered in Photoshop.
Is there any way I persuade Photoshop to honour the chromatic adaptation implied by non-D50 white points? I am using CS2 on Windows.
Thankyou for any help.
John Jefferies
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