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Automate DPI Altering With ImageMagick

Mar 23, 2010, 14:33 (0 Talkback[s])

[ Thanks to slonkak for this link. ]

"One of the most mundane tasks I have to perform after a photo shoot is editing the dots per inch (DPI) of the almost-finished photos so that they print at the correct sizes (4x6, 5x7, etc.). This process usually involves me opening each photo, one at a time, and increasing the DPI until I see the print size reach the desired dimensions. For a couple photos, while mundane, this task isn't bothersome. However, when there are 96 photos to alter as in one of my recent shoots, this task can take forever.

"In a Charles Epps moment, I realized that math could solve this problem. So the first thing I did was derive the equation I would need to determine the needed DPI of a photo:"

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