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Understanding the Resolution of Digital Images How to calculate the resolution to apply when scanning?? As an image of 3000 px (longest side) can be printed in 8 x 10 to 300 dpi, apply the following formulas; 1- When the longest side is smaller than 10 inches: 5 x 7 inches Print 3000 ÷ longest side (7 inches) = number of dpi, scanned at 100% 3000 ÷ 7 = 429 ppi at 100% (round up to 450 ppi)* 35 mm Slide (0.9448 x 1.417 inches) 3000 ÷ longest side (1,4 inches) = number of dpi, scanned at 100% 3000 ÷ 1,4 = 2143 ppi at 100% (round up to 2400 ppi)* Document 2- When the longest side is greater than 10 inches, but smaller than the scan area, scan at 300 dpi (ppi) to 100 %. 3- When the longest side is larger than 10 inches and larger than the scan area, scan the document into sections at 300 dpi (ppi ) to 100%. Then assemble the sections into a single image in editing software like Photoshop. It can then be saved in its final dimensions, or reduced to 10 inches (3000 px longest side) when saved. In both cases, it is also important to keep each section as independent images. * Scanning at a higher resolution than necessary (10-15% more), can sometimes correct various minor defects (dust, colors, etc..) Simply by reducing the image in Photoshop to standard dimensions. For higher resolution images, just do the calculation by replacing the value of 3000 pixels on the longest side, by 4500 or 6000 pixels. Scan Area Community Digitization Program of Prescott-Russell 5