Epson Expression 636 User Manual - TWAIN 32 - Page 96

t Color page sequence reading The scanner scans the document three times (one each for green, red, and blue), and produces three pages of image data that combine to give full color image data. Since the image data can be divided into three sets, a computer with limited memory or processing speed can handle it more easily. t Color line sequence reading The scanner scans the document with one pass of the carriage, reading green, red, and blue for every line. This yields more accurate color separation. Because the color for each pixel can be determined as soon as it is read, the color correction function can be used. t Monochrome reading (standard) The scanner scans the same way as in the color line sequence reading until information is stored into image memory. Then the scanner makes the monochrome image data from three primary color image data by using the control circuitry. t Dropout colors (monochrome reading only) The dropout color is the color you tell the scanner not to read. You can choose green, red or blue for the dropout color. Use a dropout color when you do not want to read one of these colors-for example, when scanning an image on a colored background. Halftoning Mode Halftoning is a process of changing an image to a pattern of dots. This is required because a printing press produces images in a different way than photography does. B-6 Expression 636 Scanner Settings