Resampling

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Resampling a digital image means change its own dimensions by using an interpolation algorithm.

This method is used to set the proper dimensions for printing, web publishing. Every interpolation modify the resolution of image by adding pixels (upsampling) or throwing out pixels (downsampling).

The overall process can be subdivided into two steps:

reconstrucion of continous image from discrete image data
generation of a new discrete image by taking samples off this continous image data

Upsampling is a critical job as pixels must be "added". But interpolation cannot add any true data to the image, it can add "apparent detail" by predicting what should appear between pixels.

Resample tool usually offers more interpolation algorithms chooses, allowing you to use the best method to reduce the loss of image quality due to the interpolation.