Glossary - Canon CanoScan FS4000US 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 threshold value determines which
value, black or white, is used to represent a dot that carries a given brightness value.
• An 8-bit grayscale image can be expressed in black, white and 254 shades of gray.
• A 14-bit grayscale image can be expressed in black, white and 16,382 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 42-bit color image can be expressed in 4.4 trillion colors, which is achieved by combining
16,384 shades of red, green and blue (14 bits each) to each dot. The file is approximately double
the size of a 24-bit color file.
Black Point Eyedropper Tool
A tool for sampling a portion of an image adjusted with the histogram 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. The
higher the value, the brighter the image, and conversely, the lower the value, the darker the image.
Calibration
A scanner driver function that automatically sets the correct white color balance to scan film with
more accurate colors.
Channel
The red, green and blue elements of a color image. Color images have 14 bits of data per pixel for
each channel, so each pixel has 42 bits of data. The brightness and contrast can be varied
individually for the red, green and blue colors when scanning a color image. The master channel is
the composite of these three colors.
Appendices
FilmGet FS User's Guide
1
2
3
4
5
115