Epson 1640SU - Perfection Photo Scanner, Справочное руководство, Страница: 66 / 192

3-12
Understanding EPSON TWAIN Features
Color Smoothing
Select either On or Off . When On is selected, colors in an image
are related to limited number of index colors. This is useful when
scanning large areas of solid colors (for example, logos,
illustrations, and charts).
Note:
❏
The pixel depth of output image is 24-bit color.
❏
Color Smoothing is available only when Pixel Depth is set to 24-bit
color .
Auto Exposure Option:
Select either Photo or Document . You can see the effects of the
Auto Exposure Option setting in the Preview window when you
click the
Auto Exposure
button.
Dropout:
Select a color to subtract from a black and white scan of a colored
original. Proper use of dropout can improve the quality of your
black and white scans. Available dropout options are:
None , Red , Green , and Blue .
Note:
❏
Dropout is available only when Pixel Depth is set to 14-bit Gray ,
8-bit Gray , or Black & White .
❏
Depending on the image you scan, you may need to adjust the
Threshold setting in the Image Controls dialog box to enable this
feature.
B/W Option:
Select from:
Text Enhancement Technology , Auto Area Segmentation ,
or None .