Epson ActionScanner PC User Setup Information - What You Should Know Before Sc - Page 10

300 dpi WHAT IS INTERPOLATION? Each flatbed scanner has a maximum optical resolution based on the physical number of light sensors in the bed. For example, a 400 dpi scanner has 400 sensors per horizontal inch. Despite this maximum value, many scanners can use a process called interpolation to achieve higher resolutions. Interpolation allows the software to make an educated guess based on mathematical probability to determine the value of pixels it can't see and then insert these values in the final image. Interpolation can be especially useful to improve the jagged appearance in some line drawings, as shown in the samples on the left. Epson scanners use interpolation to double the scanner's native resolution, so our 300 dpi scanners achieve apparent resolutions of up to 600 dpi, and our 400 dpi scanners attain resolutions of up to 800 dpi. By using the enlargement feature, which goes up to 200% on most programs, you can even "stretch" the apparent resolution on a 400 dpi scanner to 1600 dpi. 600 dpi, using interpolation