[magick-users] Xor/Visual diff - image compare vs Beyond Compare

[EweTwo]

I have a bunch of similar images that are very close in content but maybe
just slightly different enough to not be easily perceptible to the human
eye. The main problem is that some of the images have differing aspect
ratios but I am correcting that manually and resizing the images where
needed. My question is is there a similar or equivalent function to the
image comparison feature in the Beyond Compare tool. I know IM has compare
and convert but BC2 can present the visual equivalent of a diff in a center
panel with the two images surrounding it. This seems to be some of sort of
XOR'ing operation similar to compare in IM but with a tolerance slider as
well as some other options. I've tried the basic compare functions - and
while very useful - are not exactly what I intended to produce. Is there a
way to approximate this behavior in IM? I noticed that convert has a compose
XOR option and I thought this may be a way to highlight the major
differences between the two. (I am not so much concerned with palette or
saturation but whether the images are different from a POV view. The litmus
test is if I align the two and flip between them I should see no perceptible
motion) The other problematic issue is that the images are not always the
same saturation or palette or quality but their content is basically the
same but slightly different enough (<5%) to warrant scrutiny. Any
suggestions or code would be greatly appreciated. 

On a unrelated note, does anyone know of a package to automagically overlay
and auto-align/calibrate similar images. I've been doing this manually with
some packages and its quite a pain as some images have been cropped and
others have more content in them. (not to mention correcting the aspect
ratio in some instances as well) I've seen this done in extreme cases like
some of the old bigfoot footage from the 60's where the subject was aligned
into the frame by adjusting the pitch/rotation of the image. My case isn't
that severe but there must be some method of edge detection to "lock" the
images together. A lot of the lasso tools seem to have this functionality,
can it be applied to the overlay as a point of comparison to the original?
Are there commercial alternatives for this?
-- 
View this message in context: http://www.nabble.com/Xor-Visual-diff---image-compare-vs-Beyond-Compare-tf4522622.html#a12901811
Sent from the Magick-users mailing list archive at Nabble.com.