Changing Image Size

To select an image size for either preview or acquire, the Scan Generate Preference window must be visible. Click and hold either menu (preview/acquire) in the Image Size Options until the image-size menu entries appear. A dot designates the current size. Select a new size to change the preview on-the-fly or to set the to-be-acquired size.

Creating a new Image Size

Select Edit Size from either popup menu:

A new window appears that can be used to change, add, or delete items from the Edit Size menu:

128 square (aspect ratio of 1:1) is the default image size for both preview and acquire. A new size can be selected from this dialog's pop-up menu as it can be from the image-size menus. Selecting a different size will change the dialog's image parameters as shown below for the pre-defined 640 x 480 size:

The Auto Ratio check box simplifies image size definition. When checked, only the horizontal size needs to be supplied. The other sizes and spans will be calculated according to the horizontal and vertical ratios. The ratio entries cannot be decimal fractions, but can each be as high as 16384. Therefore, a ratio of 4.151 x 3.227 can be created by entering 4151 and 3227 into the respective ratio boxes; however, the spans are necessarily limited to integer values, so that such high precision in selecting the ratios may be meaningless. Aspect ratios of greater than or less than one can be defined. When any available edit field changes, the rest of the fields are recalculated on-the-fly. The software tries to be smart about second-guessing what the user wants, but changing too many parameters back and forth in this window will confuse the recalculation. Before adding the newly defined image, double check that all the numbers are correct.

With Auto Ratio unchecked, the user is free to select both the horizontal and vertical sizes, as well as the spans:

Any number of sizes can be set up and saved independently for both preview and acquire. After entering the desired values, the user must click on either Change or Add (the user can also Delete any defined image size) before exiting by clicking OK. If this is neglected, the new definitions or deletions will not stick.