UMAX Technologies Astra 4000 - Manual (Page 22)

2. Enter the desired scale factor in either the Width or Height text box. When locked, width and height
entries are identical. The width and height fields are dynamic, updating one field automatically
changes the other field. If the scale output size is unlocked, you can se the width and height output
dimensions individually.
3. To change the unit of measure, click on the down arrow next to Height and/or Width text boxes to
display the possible settings. You can choose from Inch, Centimeter, Pixel, or Percent.
4. Click
OK.
Using the Auto Adjustment Feature
Auto Adjustment provides a simple way to adjust the light and dark values of a color or grayscale image
you want to scan.
To automatically adjust the light and dark values:
1. Place the item you want to scan on the scanner’s object glass.
2. Click
the Preview button from the VistaScan Advanced window.
3. Select an area that you want to adjust using the Frame tool
You can edit the Preview image before scanning the final image using the “Zoom Tool” and the
“Frame Selection Tool”. To find out more about how to use these tools, click on the user tips text that
appears when your cursor pauses over the tool.
NOTE: To use VistaScan online help you must have a browser installed on the system.
4. Click
the Auto Adjustment check box. The selected area is adjusted and the preview image refreshes,
displaying the results you can expect when you perform the final scan.
Using the Scan Control Unit
The Scan Control Unit contains the Preview and Scan buttons, and the Scan To options.
22