Right. I was wondering the rationale behind that.
#1
I haven't given it a thought for the other blends, but Lighten and Darken modes would apear to be redundant in LAB, since LAB provides a separate Luminance (or Lightness) channel with all chromatic data in the other two channels.
#2
Francesco,
More on this in the topic "Apply Image in LAB Question" posted by George Brown 02:47am Mar 18 2008:
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http://www.adobeforums.com/webx/.59b4b7c0/3>
George
#3