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you can compare the images directly to see if they are the same:
if image1 = image2 then put "images are the same"
but how exactly do you mean 'shapes'?... I suspect you have a specific effect in mind that you have seen in other programs such as photoshop, so a more exact explanation of what you're looking for would help.
OK, what i am trying to do is the following:
I have an application that uses a digital camera. I would like my user to take a picture of an object (e.g., a house) and then the program to automatically compare this picture with those in its database and display some information (in audio or text form). As image comparison is an extremely difficult problem thats why i said to base the whole comparison on shapes only. However, colours or another property of the pbject could be possible.
in that case, you will probably not be able to do that with Director as it's imaging lingo is inherently slow for such analytical and comparison algorithms of image data. The only solution is to find an Xtra or develop your own based on established algorithms which you might be able to glean from the net - and a good place to start for that is google goups: comp.graphics.algorithms