Interpolation: In an image
interpolation adds extra pixels. It's done with some zoom lenses.
A few cameras achieve their upper-most resolution through interpolation - that is, the
camera actually can only achieve a lower resolution, and then it electronically makes the
image larger. These interpolated images are usually not as sharp as a normally captured
image.
Interpolation works pretty well for images that aren't going to be printed to look like
true photographs - for example, newspaper photographs in which the individual dots of ink
can be seen with the naked eye. Whatever problems interpolation may cause are pretty well
masked by the coarseness of the printed image.
Unfortunately, interpolation doesn't work nearly as well in pictures in which we want high
resolution - for example, when we are making photographic prints from our digital images.
Here's why: The software program doesn't always guess "right." And where it
guesses "wrong," we end up with "noise" in the image - that is, with a
coarseness of tiny dots that don't look right to the eye.
You can ignore interpolated resolution figures stated by manufacturers. Interpolation is a
process used by photo editing software in which a computer chooses an appropriate pixel
color based on colors of surrounding pixels. This process allows enlarged photos to look
smooth, even if they were made at lower resolution. However, it is not magic, so some
details may be lost in the process.
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