> How about setting the 'Select rectangular regions' to the dimensions you
> want, mark out the section you wqnt and then crop selecting 'From
> selection' button. I use this procedure when cropping photos to the
> print size to fit the paper.
I don't know if this exactly what I need, I am talking about ratio, not
dimensions. I mean dimensions change, but ratio (the rate between length
and height) is the same.
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