Glossary - Canon CanoScan FB 1200S User Manual

Glossary

Auto Correct Tool
An automatic function that adjusts the highlights and shadows of a
preview image to optimal values.
Bits/Number of Bits
A 1-bit image can only be expressed in black and white. The thresh-
old value determines which color, black or white, is used to represent
a dot that carries a given brightness value. See 'Threshold.'
An 8-bit grayscale image can be expressed in black, white and 254
shades of gray.
A 12-bit grayscale image can be expressed in black, white and 4,094
shades of gray. The file is approximately double the size of an 8-bit
grayscale file.
A 24-bit color image can be expressed in 16.7 million colors, which is
achieved by combining 256 shades of red, green and blue (8 bits
each) to each dot.
A 32-bit color image can be expressed in 6.7 billion colors, which is
achieved by combining 4,096 shades of red, green and blue (12 bits
each) to each dot. The file is approximately double the size of an 8-bit
color file.
Black Point Eyedropper Tool
A tool for sampling a portion of an image adjusted with the histo-
gram adjustment mode. All areas of the image that are darker than
the point sampled are changed to black. See also 'White Point
Eyedropper Tool."
Brightness
The relative brightness of an image or part of an image detected by
the scanner when scanning.
Calibration
A scanner driver function that automatically sets the correct white
color balance, which is used as the registration key for producing the
other colors.
Color Balance
The balance between red, green and blue elements in an image. You
adjust the color balance when a particular color is too strong or weak.
Color Matching
The gamut of colors scanned with a scanner occasionally varies from
those reproduced on a particular monitor. Use of a color matching
system ensures that the devices reproduce the colors the same way.
Appendices
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