Resizing Images:
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If you want to directly enter a size for your image, you can use the Size fields in the Image Inspector. Your image will immediately resize as you change the values in the fields.
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If you want to resize your image to just fit a set of pixels or vectors, first select those pixels and/or vectors. Then choose the Image > Crop to Selection menu item.
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If you want to crop your image to an arbitrary rectangle, select the Image > Crop menu item and then click and drag the rectangle you want to crop your image to.