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I am stumped. It has been a while since I tried doing a luminosity mask, and I have clearly forgotten or overlooked something. I have spent hours experimenting, but to no avail.
I load an image from LR4 into CS5. It is now a 16 bit RGB TIFF file. I click on Actions, then on 'Super Dark Selection', then the Play Selection button. I now have an image showing the marching ants and I have five channels in the Channels palette; the four standard RGB ones and the 'Super Dark Selection' channel. It is at this point I have tried a few different things; with no success.
The four RGB channels are selected and the 'Indicates Channel Visibility' eye is present. I click on Layers, then on the 'Create New Fill or Adjustment Layer' button, then on Curves. I get the Curves Adjustment palette, but the image no longer has marching ants and the change applies to the whole image.
I select the Super Dark Selection channel by doing ctrl + 6 (which is what is next to the LM mask channel). I now see a negative of the image on my screen and only that channel has the 'Indicates Channel Visibility' eye next to it. I then click on Layers, then on the Create New Fill or Adjustment Layer button, then on Curves. I get the Curves Adjustment palette, but the image no longer has marching ants AND the whole images is a translucent red (like I turned off Green channel except it is red rather than magenta). The change applies to the whole image.
Note that when I move my mouse over the "Add a Mask" button at the bottom of the Layers palette, I get a black circle with a line through it, indicating that option is not available to me.
So I think the problem is I can't convert from the active luminosity selection to a luminosity mask. If that is indeed the problem, I don't know what is causing the problem.
What the heck am I doing wrong?! I find this particularly frustrating as I used LM masks on a few images several months ago with no problems (same LR, same PS, same actions).
Your help is GREATLY appreciated!