Canon N650U, N656U, N1220U Glossary, Auto Tone Correction, Bits/Bit Numbers, Black Eyedropper Tool

Glossary

Auto Tone Correction

A function that uses brightness/contrast and gamma value settings to automatically analyze and adjust images.

Bits/Bit Numbers

Each dot of a 1-bit image is assigned either black or white according to the threshold brightness value, resulting in the image being reproduced in just those two colors. Each dot of an 8-bit grayscale image can be assigned any one of 256 tones of gray, ranging from pure white to black. Each dot of a 24-bit color image can be assigned any one of 16.7 million colors since each of its color channels (red, green and blue) can be expressed in 256 distinct color tones (8 bits).

Black and White

An image mode used to reproduce images in two tones only: black and white. The brightness level at which a dot is determined to be either black or white is called the threshold value, which can be adjusted. See Threshold Value.

Black Eyedropper Tool

Tool used to the select the darkest portion of an image in the preview area. Used with the Histogram function to adjust image brightness. When this tool is clicked on the image, all areas that are darker are set to pure black.

Brightness

The intensity of light in a scanned image. Raising an image’s brightness increases its overall brilliance, while decreasing it makes it darker.

Calibration

A scanner function that automatically adjusts the scanner’s white balance to true white.

Color Balance

The function in that enables you to adjust the blend of colors in a color image. You can adjust the color balance by altering the blend of the red, green and blue color set or the cyan, magenta, yellow and black color set.

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