On images derived from grids, left click, drag and left click again. The rectangle thus defined is used to extract a subset of the original grid. This corresponds to an interactive version of the grdcut GMT program with the advantage that you will not fall onto the grips of the "Ivan the Terrible" (I mean the despairing message: GMT ERROR: (x_max-x_min) must equal (NX + eps) * x_inc), where NX is an integer and |eps| <= 0.0001). Note, this is a crude and poorly controlled way of doing a cropping operation. The best way is to draw a rectangle on the image. Calmly decide on its size and position (or conversely, on its limits) and than inquire its properties (by a right-click on the rectangle borders) for “Crop Tools -> Crop Grid”.
Copyright © <2010>, <Joaquim Luis>
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