Plustek MobileOffice D28 User Manual page 28

Descreen - applies filtering to images that contain moiré patterns (or herringbone). A
moiré pattern is created from scanning pictures in magazines, or printed material that
use color dithering. The descreen filter is not needed when scanning original
photographs or black and white images and text, but is recommended when scanning
any printed color graphics, such as a page from a magazine, in order to remove the
unsightly interference patterns which may occur.
Front/Rear Side tab – decide which side paper to scan when you select simplex
scanning.
Brightness – This is amount of light that is concentrated onto a document while it is
being scanned. Raising the brightness increases the amount of white in an image,
making it appear more washed out. Lowering the brightness may help you read light or
faint text.
Contrast – adjusts the tonal range of an image by lowering mid-tone values and
increasing values for high and low tones. The higher the contrast, the sharper the
image will be. The lower the contrast, the blurrier an image will be.
Gamma – Use the slider to adjust the image gamma for the scanned image. Gamma
values are primarily a measure for the color brightness. The larger the gamma value,
the brighter the color becomes. Changing the image's gamma value allows you to
change the brightness of the colors IN THE IMAGE ITSELF.
File Format - Choose which file format you want the scanned image to be. The
following file formats are available from the drop-down menu:
BMP (Windows Bitmap) - (Bitmap file - also known as a "bump" file) is a
Windows and OS/2 bitmapped graphics file format. BMP is the Windows
native bitmap format. BMP files provide formats for 2, 16, 256 or 16 million
colors (1-, 4-, 8-, and 24-bit color).
JPG (JPEG) - (Joint Photographic Experts Group) JPEG (pronounced "jay-
peg) is a format that is commonly used for color images displayed on the
Internet. JPEG reduces the file size of an image by discarding some of the
non-critical data of the image. JPEG retains all of the color information of an
image and offers varying degrees of compression.
TIF (Aldus Tiff) - (Tagged Image File Format) is a widely-used bitmapped
graphics file format developed by Aldus and Microsoft that handles
monochrome, gray scale, and 8/24-bit color.
PNG (Portable Network Graphics) - PNG is an extensible file format for the
lossless, portable, well-compressed storage of raster images. Sample depths
range from 1 to 16 bits per component.
File Name Prefix - The file name of the scanned images will be a combination of your
own defined file name prefix and the four digits number issued by the system.
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