Re: [Gimp-user] Processing a stack of images

[Pat David <patdavid gmail com>]

I feel like you may have better luck with something dedicated to image
distortions. Like Hugin.

It's relatively trivial to align many images, and then define
horizontal/vertical reference lines, and stitch away!

On Saturday, July 20, 2013, Geoff Smith wrote:

> 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 was
> used, with the book supported on foam wedges. Consequently, both pages in
> each 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 for
> several hundred images is a non-starter, and anyway that's what the machine
> is for.
>
> Proposed solution :
> Import an image to the Gimp.
> Drag and drop a number of images into the same project - as many as the
> machine 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 that
> the Gimp progressively works down the layers. But, although each right-hand
> page is correctly 'squared up', all the left-hand pages, other than the top
> layer, are enlarged and cropped.
>
> Am I misusing the Gimp, or hoping for too much?
> Has anyone done something similar?
>
> Software used :
> 2.6 under Debian Squeeze.
> 2.8.2 under Mint 14.1
> 2.8.6 under Windows 7
> All OS 64-bit.
>
>
> Geoff Smith
>
>
>
> --
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-- 
pat david
http://blog.patdavid.net