image editing: comparing right parts / bottom parts?

Hi,

I'm using the Digikam's image editor to adjust color curves. The buttons
for comparing the original and the target allow me to compare the left
side of original and target, or the top of original and target. Is there
a way to compare the right sides or the bottom part? Turns out I have
quite a few images where the important parts are in these areas...

Thanks,

Michael
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