Subsampling

For the signal processing technique, see Downsampling.

For the technique used in analytical chemistry, see sub-sampling.

In computer graphics, subsampling (or "downsampling") is the process of reducing an image to a smaller size. It is a type of image scaling, usually used to alter the appearance of an image or reduce the quantity of information required to store an image.

Methods of Subsampling

Two commonly used methods of subsampling are replacement and interpolation. Replacement selects a single pixel from a group and uses it to represent the entire group. Interpolation uses a statistical sample (such as the mean) to create a new representation of the entire group.

See also

• Resampling
• Chroma subsampling
• Sampling (signal processing)