Quoting Asif Lodhi <[EMAIL PROTECTED]>:

> I've begun using Gimp again after a long time. IIRC, one (more?) tool
> of Gimp had an option of making a selection that went through all the
> layers right to the bottom layer. And, IIRC, having made that type of
> selection in one of the top layers and performing an operation on it
> would carry out the operation on the combined output of all of the
> bottom layers. May be I am wrong here but I do vaguely recall such an
> option after reading on this list about non-destructive editing
> features of a commercial photo-retouching applications.

To my knowledge, there are no operations which behave that way.

If you have installed the GAP (GIMP Animation Package) then you can  
use the "Filter All Layers..." command but this is limited to only  
those filters which are specially registered with this capability  
(i.e., it does not work with "tools" such as Move or Rotate, nor with  
most "third-party" scripts). It is a very useful utility and nearly  
all of the GIMP's core filters ARE available.

In version 2.4 of the GIMP (which is in the final stages before  
release), if you have a selection and the active layer is linked to  
other layers, performing a Transform (rotate, scale, perspective,  
skew, or flip) will affect the contents of the selection on the active  
layer but will affect the entirety of the other linked layers. I can't  
recall if version 2.2 behaved this way.

The Move tool behaves differently in that it is not possible (in  
version 2.4) to use it to move the contents of the selection; and the  
established method of doing so (using the Selection tools) does not  
honor layer linkages.

In order to Move or Transform the selection contents across multiple  
layers, I have written a Script-fu which will "float" the selection  
for each linked layer.  Once they are floated as separate layers, the  
floated layers can be Moved or Transformed as a group (the script  
links the floated layers) and subsequently merged back down to their  
original layers.

My script is quite a kludge: you must be careful with any changes to  
your layerstack while the selections are "floated", and some blending  
modes of layers will not behave as expected. If interested, you can  
read more about the script at  

In general, if you find yourself operating in a manner such that this  
script is useful then I would recommend that you rethink your overall  
approach to what you are editing and try not to have objects which you  
wish to treat separately sharing the same layer to begin with.

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