Image Properties:
The Metadata slice lets you edit your image's metadata. If your image has multiple frames, you can also toggle to editing the current frame's metadata.
The Size slice lets you edit the width and height of your image (which can be linked). You can also change your image's resizing settings by clicking on the resize springs and struts. If a position has a spring then it changes when your image is resized and if it has a strut then it doesn't change when your image is resized.
The Origin popup lets you change the origin for your image. You can have a bottom left based origin (like in Mac coordinates) or a a top left origin (like in iOS coordinates).
The Resolutions table lets you add, remove, and edit the resolutions in your image. Click the plus button to add resolutions.
The Units popup lets you change the resolution units for your image. This determines how resolution sizes are displayed.
The Color Space popup lets you edit the color space used by your image. You can use one of the recommended color spaces, use None for no color space, or click the Choose button to import your own custom color space.
The Background popup lets you choose what kind of background to show behind your image.