Canon N650U - Manual (Page 62)

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Moiré
The patterns or lines created by overlapping dots in an image. This
phenomenon is found when photographs or pictures are scanned from books
and magazines at low resolutions. The Descreen function helps to eliminate
moiré patterns.
Optical Resolution
An expression of the volume of data per inch (dpi) that can be sampled by a
scanner.
Pixel
An abbreviation of picture element, the smallest element on a monitor screen.
Plug-in Software
A program that extends the functionality of an application program. Plug-in
Module CS-U is a driver plug-in that adds scanning capabilities to programs
such as CanoScan Toolbox CS and PhotoStudio 2000.
Preview Area
Area at the right of the Plug-in Module CS-U window used to display preview
images. Clicking the [Preview] button causes the scanner to scan its platen and
reproduce the image in the preview area. Please note, however, that preview
images do not get downloaded to the application program in use.
Preview Scan
A low-resolution, trial scan of an object. The image shown in the preview area
can be used to adjust the scan area, brightness and color balance before
initiating the final scan.
Resolution
The density of the dots used to express an image. Image fineness or coarseness
is expressed as the number of dots per inch (dpi). See also DPI.
RGB
A color set of red, green and blue: the three primary colors of light. The scanner
picks up light reflected off objects with its red, green and blue sensors. Color
printers output color using the complements to the RGB color set, which are
cyan, magenta, yellow and black (CMYK). Cyan, magenta and yellow are called
the three secondary colors.