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I am using a template matching algorithm to find a region in an image.

Now there is something strange about the templates I am using. Some of them work and some others don't. And I can't find out the difference. They share the same size, channels and file format. The only difference I found is the size.

Can you tell me what the difference is?

See here:

Image1 (4kb): https://www.dropbox.com/s/2fqlu7m5w6gtcg8/hist1.png

Image2 (5kb): https://www.dropbox.com/s/5q6yasitszdzwn4/hist2.png

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