b>x_position</b>, <b>y_position</b>) and size <b>width</b>
x <b>height</b>. This cropping area must be fully contained
within the source rectangle. The top-left corner will be
snapped to even coordinates if needed. This option is meant
to reduce the memory needed for cropping large images. Note:
the cropping is applied <i>before</i> any scaling.</p>

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