Quoting Joshua Simons <[EMAIL PROTECTED]>:
> I am trying to blend two exposures using the 2nd technique ("Layer
> Mask")
> described at this URL:
>
> http://www.luminous-landscape.com/tutorials/digital-blending.shtml
>
> To use this given two exposures, E1 and E2, I need to find a way to
> use E1
> as a layer mask for E2. Is that possible using GIMP?
The quickest way that I know of is to drag the thumbnail of E1 from
the Layers window to the Channels window. Then you click on the
square, red button ("Replace the selection with this channel"), go
back and activate layer E2, and perform an "Add Layermask"
initializing the layermask to "Selection".
I have written a Script-fu which will create a selection from the
current drawable which simplifies the above process a little:
* Perform Select->None. (because the script honors the selection)
* Perform "Select->From Drawable" on E1. (this command is added to the
Select Menu when you install the script)
* Perform an "Add Layermask" on E2; initializing the layermask to the
"Selection".
The script is available at
http://www.flashingtwelve.brickfilms.com/GIMP/Scripts/layer-select.scm
if you choose to use it. There are two other commands added:
"Select->Layer Bounds" (which just makes a rectangular selection the
same dimensions as the layer) and "Select->To Layer" (which creates a
new layer from the selection using the FG and BG colors).
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