Canon CanoScan FS2700F User Manual - Page 69
Adjusting Threshold Settings (Easy/Expert Mode
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Step 3 • Adjusting Images Adjusting Threshold Settings (Easy/Expert Mode) In easy mode or expert mode, the threshold tab can be used to adjust the threshold value (the demarcation between black and white) of black and white images. Images are collections of data assigned varying brightness values. 24-Bit Color and 8Bit Grayscale images express the brightness with values ranging from 0 to 255. When a black and white image is processed, brightness is expressed with only two values, black (0) or white (255). Accordingly, a point has to be determined at which a dot is determined to be either black or white. This point is called the threshold value. By changing the threshold value, you can alter the appearance of an image as shown below. The default setting for CanoCraft FS is 128. Threshold Tab Click the [Image] menu and select [Adjust] or click the [Adjust] button. Threshold Tab Change the settings with the slider or by directly inputting values into the boxes. You can save and reload the settings. Dragging the slider tab or clicking the arrows changes the settings. To input a value directly into the box, click it and type a number from 0 to 255. Typical Scanned Image Saves settings to a file with the extension [.adc] for color images. Loads settings from files with the extension [.adc] for color images. Restores the threshold value to 128, the default value. Larger number input or slider moved to the right Lower number input or slider moved to left 69