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Step 6: Cutting out the regions of interest

Explains how to 'blow-out' or 'zoom-in' to the region of interest.

(box H5)
(crop H0 H$6)

Once we have the general overlay, that effectively summarizes all the available information, we can choose to cut out a specific section out of all the images. The (box) operator allows the user either to select two points (the top left corner and bottom right corner), or 4 points (top left, top right, bottom right and bottom left) corner. If the second point is chosen with a right mouse click the two-point input is assumed. The (crop) function performs an affine transformation of the input given the selected box. It throws away everything else.