I have searched a lot about this, and couldn't find anything apart a few lines 
in an old summer of code page, and in this old webpage :
unfortunately this patch only applies to 2.3

this is why I allow myself to post here as a feature wish, even though I am 
absolutely not a coder.

I am using GIMP every single day for my 3D texturing work, and i have to blend 
together parts of photographies in an interactive way. 
Parts need to be lined accurately so that you don't create blur in the 
blending areas.
( someone told me Hugin does it perfectly, but at a first glance, it seems to 
involve complex settings and a lot of click work before it computes a 
solution, when you just need to move things on the fly and see how it goes . 
Hugin seems to be more suitable for assembling large images together than a 
lot of little parts )

As GIMP is now, you need to move/scale/rotate/shear/perspective a selection or 
a layer, apply transformation, check if it lines good, undo, transform again, 
check, etc, because the preview always turn to totally opaque , whatever the 
layer opacity is.

Having a little slider to set the preview mode/transparency would be a real 
enhancement for this kind of workflow.
Another clean solution would be that the preview simply follows the active 
layer mode/opacity .

I have read about Iwarp as a tool, that combined with a transparent transform 
preview would turn GIMP into a fantastic texturing tool.

I have no clue how difficult it can be to code this, but I hope the developers 
of GIMP can find an interest in this.

With all my thanks for all the work done,


patrice poly
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