GIMP :: Processing A Stack Of Images (2013)

Problem :I have a large number of ex-camera jpegs of the pages of a book,photographed at an archive where scanning is prohibited. A camera stand wasused, with the book supported on foam wedges. Consequently, both pages ineach image are distorted - i.e. each page of a pair is a trapezium.It is, of course, a simple matter to crop and apply the perspective tool(twice) to an image to restore the pages to their flat state. Doing it forseveral hundred images is a non-starter, and anyway that's what the machineis for.

Proposed solution :
Import an image to the Gimp.
Drag and drop a number of images into the same project - as many as themachine can handle.
Link the image layers.
Crop.
Select one page and use the Perspective Tool to pull the page 'square'.Repeat for the second page.
Export each image, working down the stack.

Result :Selecting the right-hand page and correcting the perspective works, in thatthe Gimp progressively works down the layers. But, although each right-handpage is correctly 'squared up', all the left-hand pages, other than the toplayer, are enlarged and cropped.

Software used :2.6 under Debian Squeeze.
2.8.2 under Mint 14.1
2.8.6 under Windows 7
All OS 64-bit.