Digital Rectified Image Standard

1:20000 photograph scanned at 1200 dpi allows a straight enlargement to a 1:5000 image at 300 dpi. (1200 dpi / 300 dpi = 4. Therefore 1:20000 can be enlarged 4 times to 1:5000. The 1:5000 image is now at the maximum output resolution of 300 dpi.) ................
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