Epson CX6500 Reference Manual page 326

To scan an image that appears as a thumbnail, select the checkbox under the image you want to scan and
click Scan.
To modify a thumbnail image, click the image to select it, then select your settings. The selected image
has a blue frame around it.
To apply the same modifications to all of the thumbnail images at once, click All.
To enlarge a thumbnail image, select it and click the Full Size tab. An enlargement of the selected image
appears in the Full Size menu, allowing you to see the effects of your settings in more details.