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Digital image size in pixels and photo print size
This article is about the relation between an image size in pixels and a photographic print size. First, it recommends the photographic print size for given digital image dimensions in pixels. Second, it finds the resulting pixels per inch value for a printed digital image with known linear and pixel dimensions.
Inches to pixels and pixels to inches converter
This online calculator converts inches to pixels and vice versa given the resolution in pixels per inch
Adjusting picture/pixel sizes proportionally
This online calculator adjusts the second dimension of a picture/video, given the new first dimension, keeping the original proportions
Invert image colors
This online calculator inverts image colors and produces photo negatives.
Tips and tricks #13: Bitmaps and Pixel manipulation
This article describes how to write calculators for an image manipulation
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