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 What Is Resampling and What Does It Mean in Photography?

In photography, specifically post-processing and image editing ‘resampling’ is the process of altering an images resolution by either adding or removing extra pixels. Increasing the number of pixels in an image is often referred to as upsampling, reducing the number of pixels is referred to as downsampling. Resampling has two direct effects on an image file, firstly the resolution of the file will be altered depending on the number of pixels either added, or removed, and secondly the image file size will change. The actual process of resampling an image requires the application of a mathematical algorithm to the image file, once the algorithm has been applied the resulting image can be rendered for viewing.