ut not the ENTIRE blurred image. I only need the portion of the blurred image that "fits" within the dimensions of the origianl.
what ho said first. put a loose selection around the individual. copy and paste to new layer.
int he actions palette, select your action and open it up (actions can't be in button mode. if they are, turn that off in the flyout menu in the action palette). place a pause on step (might be called toggle dialog or something) in your action on the gauss blur step. that will cause the gauss blur dialog to appear. you can adjust the blur amount there. you might also want to ADD another step right after the gauss dialog step. in that step add Image> adjustments> levels. adjust the levels to give you finer control over the feathering. that step too should be set to show the dialog when running the action.
this action i wrote is a little outdated, but the start of it (before adding the 3 adjustment layers) shows the steps in detail.
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http://aikodude.tripod.com/MaskNAdjusts.atn>
to summarize, for feathering:
you should select the person/thing to blend.
copy and paste to new layer.
crtl-click that layer to select all pixels.
add a layer mask to that layer.
selecting the layer mask, run gauss blur (to taste)
run levels (to taste)
between the original selection, the gauss blur and the levels commands you should have a huge amount of control over the feathering of your subject.
a final note: i usually feather as close to but not overlapping the image, then use a soft tipped eraser brush varrying opacity from 100% to say 30% to fine tune the blending even more.