Klaus,
Thanks for your answer.
There is something I don't understand about "applies your working grayscale space".
I would have thought that the file data and not the L* would be affected by the target working space. Such that though L*50 is represented in a 1.8 space as 61% and as 54% in a 2.2 space, the L* value remains the same.
Unless you mean the info pallet applies the algorithm normally employed by Photoshop for mode conversions (.3 R + .59G + .11 B). But then why would the anticipated conversion values that the info palette displays change simply by extracting the a* and b* channels?
I am using the Gretag color chart as reference. If I convert the Lab file to grayscale via Photoshop menu mode conversion, I will always preserve the L* values, no matter what grayscale space is configured by default in my color settings. Equally the info pallet will display the exact L* values of the Gretag chart regardless of the grayscale space configured in my color settings. Yet if I deactivate the a* and b* channels the file brightens visibly on the screen, even though the info palette continues to display the original L* values. But if the lab file is now converted to grayscale or if the L* channel is dragged into another file ( even to another Lab file) , the info palette will now display the L* values as they appear on the screen, that is at least L*10 brighter.
Eugene
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