Avision DS320F (DF-0707S) - Manual (Page 22)

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3.4.3 Determining a Proper Resolution
A proper resolution reproduces a clear image with good details. The resolution
is measured by dots per inch (dpi).
3.4.4 Adjusting the Brightness and Contrast
1. Brightness
Adjusts the lightness or darkness of an image. The higher the value, the
brighter the image.
2. Contrast
Adjusts the range between the darkest and the lightest shades in the image.
The higher the contrast, the bigger the different grayscale.
3.4.5 Enlarging Previewed Image
Enlarge your previewed image to the max. of the preview window.
Note: This function only enlarging your preview image. This does not enlarge
your real image.
3.4.6 Inverting AND SELECTING YOUR IMAGE
The invert command reverses the brightness and the color in the image. For
color images, each pixel will be changed into its complementary color at the
command of Invert.
3.4.7 Mirror Function
Reverse the right and left side of your image.
Auto Select Image
Automatically set the whole image as your scan area. (Or you may resize the
area by “drag and drop” diagonally.)