Jagged effect produced by naive upscaling of raster shapes with few pixels defining a curve / From Wikipedia, the free encyclopedia

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"Jaggies" is the informal name for artifacts in raster images, most frequently from aliasing,[1] which in turn is often caused by non-linear mixing effects producing high-frequency components, or missing or poor anti-aliasing filtering prior to sampling.

This image was scaled up using nearest-neighbor interpolation. Thus, the "jaggies" on the edges of the symbols became more prominent.

Jaggies are stair-like lines that appear where there should be "smooth" straight lines or curves. For example, when a nominally straight, un-aliased line steps across one pixel either horizontally or vertically, a "dogleg" occurs halfway through the line, where it crosses the threshold from one pixel to the other.

Jaggies should not be confused with most compression artifacts, which are a different phenomenon.