Canon PIXMA MP620 User Manual - Page 539

Setting Threshold Page 539 of 815 pages Advanced Guide > Scanning > Scanning with Other Application Software > Correcting Images and Adjusting Colors with ScanGear (Scanner Driver) > Setting Threshold Setting Threshold The brightness of color and grayscale images is expressed in a value between 0 and 255. However, in creating black and white images, all colors are mapped to either black (0) or white (255). Threshold is the borderline value that determines a color as black or white. By adjusting the threshold level, you can sharpen text in a document or reduce show-through in newspapers. This function is available when Color Mode is Black and White. In ScanGear's Advanced Mode, click (Threshold). Adjusting Threshold Move (slider) to the right to increase the threshold value and thus increase the black areas. Move the slider to the left to decrease the value and thus increase the white areas. You can also enter a value (0 to 255). Note Click Defaults to reset all adjustments in the current window. Page top