What Does Interpolate Mean What Talking About Processing Photographs?

When talking about photography, specifically image editing and post-processing, the term ‘interpolate’ refers to the process of enlarging an image beyond the resolution at which it was captured. Unlike simply enlarging the pixels within an image, interpolating an image involves applying an algorithm which adds new pixels to the image, therefore increasing it’s overall resolution. Interpolation also occurs when applying various kinds of digital adjustment to an image for example rotating an image at anything other than 90 degree intervals, or applying correction for barrel distortion. In both these examples pixels must be remapped to allow for a change in the overall appearance of the image, interpolation algorithms are used to achieve this. It is important to note that any form of interpolation can result in a degradation of overall image quality.