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How can I “upsample” an image to higher resolution?

April 26, 2017image resolution upsample

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How can I “upsample” an image to higher resolution?

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Higher resolution is not achievable, but smaller pixel sizes are. (Resolution means the ability to distinguish features; merely going to a smaller pixel size will not help. But it can make an image look better, especially when zoomed.) The new [16 Apr 1999] program imupsam will take as input a 2D image (floats, shorts, PGM, or PPM) and upsample it to a finer resolution, using 7th order polynomial interpolation in each direction.