Sharpening Before Printing

[JoeMead@aol.com]

Sometime ago there was a thread on sharpening. One technique described by 
Tobie that sounded great to me was:

"If you wish to apply your mask only to the Luminosity channel,  then you can 
do this right in RGB by using an adjustment layer, and applying  it through 
luminosity mode." 

With this technique you don't have to switch to LAB mode to sharpen 
luminosity only.

I didn't get a chance to try this technique when it was first posted. I got 
busy dulling my chain saw and forgot all about the technique until today.

Here's my problem.  I can create an adjustment layer such as levels, curves 
etc. Do it all the time. I can set adjustment layer to luminosity.

Now here's my question. How do you apply the Unsharp filter to an adjustment 
layer?  I've obviously missed something or don't understand Tobie's words.  
When I run the USM filter with an adjustment layer active there is nothing to 
adjust, just the white of the mask.

Can someone explain Tobies technique? 

I would rather do my luminosity USMing in RGB instead of switching back and 
forth among RGB and LAB

JoeMead
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