Canon CS-S 4.3 manual Low Contrast, Mid-Point Eyedropper, Mid-Tone, Mode, Optical Resolution

CONTENTS

INDEX

Glossary 97

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.

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