A McGraw Hill Book Plug-in PHP: 100 Power Solutions
By Robin Nixon (McGraw Hill 2010, ISBN 978-0071666596)

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Chapter 4: Plug-in 15 - Image Crop

This plug-in lets you crop a portion from an image by passing it as a GD image object, along with the top-left x and y coordinates, and the width and height to crop.

The Figure shows just one of these, Edge Detect, in use.