Use the crop tool to remove portions of an image that you don't want. To use the crop tool:
- Open the image editor
- Check the "Crop" checkbox
- Drag any one of the four blue dots (or the blue lines that connect the dots) to adjust how the image is cropped. To maintain proportions while you drag, hold down the shift key. To make single pixel adjustments while you drag, press the arrow keys on your keyboard while the mouse is still down.