I received an email in 2009 from Hawkeye Hughes of Polson, Montana, answering my question about how to do a custom crop in Irfanview. Here is his explanation:
After you select the "Create Custom Crop"
under the "Edit" header, in the resulting popup screen set the ratio that you
want, and type in the desired width (in pixels) in the second column. Make sure
the width is less than the total width of your to-be-cropped image. At the
bottom of the popup screen, select "Apply To Image", and a crop square in the
correct ratio will appear in the upper left corner of your image. Now the key
To Move the crop square, slide your cursor into the square, hold down the RIGHT
mouse button and drag the square to center on the approximate area of your crop.
To Adjust the Size of the crop box, move your cursor to the left or right
borders of the crop box until the double-headed arrow appears, then hold the
Ctrl Key down while you drag the line by holding the LEFT mouse button. Fine
tune the position of the box with the RIGHT Mouse button dragging procedure.
Thanks Hawkeye for the detailed explanation!
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