I was using the Perspective tool (GIMP 2.6) on some photos to correct for some
minor rotation/skew issues, and realized how easy it is to throw the image's
aspect ratio out of proportion -- in my case, TOO easy. My photos were of some
quilt squares, and I was using the edges of these squares as guides for
aligning a Corrective transform to correct for some minor (but visible)
skewing. Naturally, this means I'm aligning my Corrective guide to an area in
different proportion to the source image, so it throws the aspect ratio out of
whack, and I must have the squares in the photo remain square after
Is it possible for the tool to compensate for X/Y aspect ratio distortion
somehow? Or is that too much to ask?
On a semi-related note, how does the Perspective transform matrix work? I get
that the first two rows represent an affine transformation, with (1,3) and
(2,3) corresponding to X and Y translation, (1,1) and (2,2) corresponding to X
and Y scaling. What's the third row represent?
Numbers may not lie, but neither do they tell the whole truth.
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