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In my case I find it easier to approximate the maximum usable surface of a mosaic by rotating/scaling a rectangular window over the original picture rather than rotating the whole canvas and cutting by trial and error.
The interpolation/resampling problem occurs when I do crop the selection in place and it's rotated. So here's what I do now.
1_ create a small rectangle shape in another layer on top of the original.
2_ Set the opacity to 50% and color to bright red.
3_ scale/rotate the shape to maximize the area over the original.
4_ apply the transform to the shape.
5_ rotate the whole canvas of the original and the shape layer to match the orientation of the workspace.
6_ crop in place when everything is square without rotating.
Seems to work better.
Last edited by multiweb; 21-03-2010 at 11:02 AM.
Reason: spelling
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