Object is not an image when Crop command

[JosepM]

Mmhh.. but with the backpattern in correct position how crop only these
shape... 

Sorry for my questions, never I must fighted with graphics issues in Rev
until now... :)

The following is posible?
1 Export the snapshot ruled by the rect of a polygon over one part of the
image. 
2 Load the exported image and superpose the same graphic and make
transparent the difference. I don't know if I explain myself.
3 Save as transparent the image
4 Load the transparent image over the original image.

It's for simulate painted walls, and I need extract the windows, picture
frames and other nice stuff... :P

Salut,
Josep
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