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97
Glossary
Low Contrast
An image that has low contrast does not have many distinct differences
between tones.
Mid-Point Eyedropper
The Histogram tools that lets you select the midtone portion of the image in
the preview area. When you click on the image with the Mid-point
eyedropper, all tones between the black-point and the white-point are
adjusted in relation to the mid-point setting.
Mid-Tone
Mid-tones are the middle range of tones in an image, between highlights and
shadows. Midtones can be adjusted for color and grayscale images with the
Gamma tool.
Mode
The type of scan used to scan an image, differentiated by the number of bits
per pixel. ScanGear CS-S has the following scan modes:
• Color (24 bit)/Color (36 bit): Color images contain 8 bits/12 bits per
pixel each for red, green, and blue channels. Each pixel has 24 bits/36
bits.
• Grayscale (8 bit)/Grayscale (12 bit): Grayscale images contain 8 bits /12
bits per pixel in one channel.
• Text Enhanced: Text Enhanced images are grayscale images (8 bits per
pixel) converted to 1 bit per pixel using Canon ImageTrust. The default
preferences setting is to automatically use Text Enhanced when the
client TWAIN application (in UI- or Windowless mode) requests that a
black and white scan be made.
• Black and White: Black and white images are defined to be 1 bit per
pixel.
OCR (Optical Character Recognition)
OCR (Optical Character Recognition) software converts text images into actual
text characters readable by a word-processing program or similar application.
The Text Enhanced scan setting sharpens black and white contrast to assist in
the accurate recognition of characters in OCR software.
Optical Resolution
A scanner’s resolution capability. See also dpi, Resolution.