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Not possible AFAIK. You would have to resize them all first to the same size, then crop them by pixels. In the latest version you can set the order of these operations in the batch dialogue.
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I agree that there is no easy way to do it in Irfanview. You can crop a fixed size area from the center of the images using the Add canvas feature, method 2, but you cannot do a fixed percentage.
The only way I can see would be to use a script file. For each of the images it would need to read the image dimensions by using a command line with the /info=txtfile option, extract the image dimensions and calculate from them the required crop parameters x,y,w,h to use in a command line containing the /crop=(x,y,w,h) option. I doubt if that is any easier than using ImageMagick though.
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