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26
Chapter 3
Scanning
To set scanning mode:
1. Click the Main tab.
2. Select an option from the Scan Mode list. You have the following choices:
• Color (36 bit): 36 bit color images contain 12 bits per pixel for each
primary color (red, green, blue). Use this option to attain a scanned
color image of the highest quality. However, the file will be
approximately twice the size of a Color (24 bit) file.
• Color (24 bit): 24 bit color images contain 8 bits per pixel for each
primary color. Use this option to attain a scanned color image of
average quality.
• Grayscale (12 bit): 12 bit grayscale images contain 12 bits per pixel.
Use this option to attain a scanned grayscale image of the highest
quality. However, the file will be approximately twice the size of a
Grayscale (8 bit) file.
• Grayscale (8 bit): 8 bit grayscale images contain 8 bits per pixel. Use
this option to attain a grayscale image of average quality.
• Black and White: Images are expressed in two colors only; black or
white. A pixel is set to black or white depending on its brightness value
in relation to a particular threshold value. The threshold value can be
freely set. Select this option to print photographs on monochrome
printers.
• Text Enhanced: Text Enhanced images are Grayscale images (8 bits per
pixel) converted to Black and White (1 bit per pixel) using Canon
ImageTrust technology. You can select Text Enhanced in the Scan
Mode list. If the application operates in windowless (UI-less) mode, you
can select “Text Enhanced” in the Preferences tab, and request the
application to perform a Black and White scan. In this case, the
conversion to Black and White takes place automatically.
The acquiring application may determine your Scan Mode choice. For
example, if a fax application is acquiring the image, you may not be able to
choose a color mode; you may have to choose Black and White or Grayscale.
The 24 bit and 36 bit options express colors with conversions of each primary
RGB color (Red, Green, Blue). The 24 bit options can express each color with
up to 256 gradations, and 36 bit color with up to 4,096 gradations. If you
need extremely high-quality color gradation in the scanned image, use 36 bit
color. Otherwise, use 24 bit for normal color scanning jobs.