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### 37.7 Simple Image Processing

Some simple image processing capabilities are present in the Forms Library image support. All the image processing routines take an image as a parameter and process it in place. If appropriate, only the subimage specified by `(image->subx, image->suby)` and `(image->subw, image->subw)` is affected (note these are different fields from those for subimage displaying). The subimage fields are best set via user interaction, perhaps by having a rubber band that the user can drag to set the size.

In the following, each routine will be briefly explained.