Canon mp280 series On-Screen Manual page 533

Thumbnails of images cropped to the document size are displayed. Only the images with the
checkbox selected will be scanned.
Note
When multiple images are previewed, different outlines indicate different selection status.
- Focus Frame (thick blue outline): The displayed settings will be applied.
- Selected Frame (thin blue outline): The settings will be applied to the Focus Frame and
Selected Frames simultaneously. You can select multiple images by clicking them while
pressing the Ctrl key.
- Unselected (no outline): The settings will not be applied.
Double-click a frame to zoom in on the image. Click
the screen to display the previous or next frame. Double-click the frame again to return the
display to its non-magnified state.
When (Whole Image) is displayed on the Toolbar
Items on the Platen are scanned and displayed as a single image. All portions in the cropping
frames will be scanned.
Note
You can specify the scan area (cropping frame) on the displayed image. In thumbnail view, you can
only create one cropping frame per image. In whole image view, you can create multiple cropping
frames.
Adjusting Cropping Frames
(Frame Advance) at the bottom of