HP 1100 User Guide - Page 190

Resolution Generally, the ideal scanning resolution is 150 dots per inch (dpi). Changing the size of the image after it has been scanned affects the resolution. Therefore, before setting the scanner resolution, it is helpful to determine what the final image size will be. For example, you might want to scan an original that is 76 x 127 mm (3 x 5 in.), but there is only room for a 38 x 63.5 mm (1.5 x 2.5 in.) picture in your document. Set the scanner resolution to 75 dpi. Resolution Size of original Size after scanned and Recommended scanner altered resolution 76 x 127 mm (3 x 5 in.) 38 x 63.5 mm (1.5 x 2.5 in.) 76 x 127 mm (3 x 5 in.) 152 x 254 mm (6 x 10 in.) 75 dpi 150 dpi 300 dpi 180 Appendix G Scanner resolution and gray scale EN