Epson Expression 636 User Manual - TWAIN 32 - Page 92

You may need to do some trials by yourself to find out your preferred settings because the original images and the output methods you use can vary greatly. Resolution The output resolution determines how many pixels are used for scanning and reproducing an image. Resolution is measured in units of dpi (dots per inch), spi (samples per inch), or ppi (pixels per inch). All are equivalent units of measure. As the resolution value increases, the image is read and reproduced in finer detail. At 600 dpi, for example, an image of one square inch is represented by 360,000 dots. The 29 resolution settings allow you to choose the best resolution for most types of printers. The settings available are 50, 60, 72, 75, 80, 90, 100, 120, 133, 144, 150, 160, 175, 180, 200, 216, 240, 300, 320, 360, 400, 480, 600, 800, 900, 1200, 1600, 1800, and 2400 dpi. To find a matching resolution for your particular output device, follow the guidelines starting on page B-13. Size or Scale The size or scale function allows you to reduce or enlarge the size of the output image. The value can be set in the range of 50% to 200% in increments of 1%. When the scale is set to 100%, the image is scanned at the actual size for the current resolution. The scale values determine the vertical and horizontal lengths of the image. When the scale is set to 200% the image is enlarged four times the original size. When the scale is set to 50%, the image is reduced to one fourth of the original size. B-2 Expression 636 Scanner Settings