singlepixel

Singlepixel refers to the smallest resolvable element in a digital image or display: a single pixel. In some contexts it denotes a 1x1 image, a one-by-one pixel image that encodes a single color value and carries no spatial detail. The concept is foundational to raster graphics, where images are described as arrays of pixels.

In web analytics and advertising, a 1x1 tracking pixel is a common technique. A tiny image—often transparent—served from a server loads when a page or email is viewed. The request can be logged to infer impressions, timing, and user interactions while leaving visible content unchanged.

In imaging and computer graphics, single-pixel processing describes operations that affect an image at the level of individual pixels. Such concepts include neighborhood operations, dithering, color quantization, and testing routines that rely on a single-pixel sample.

Formats and size: A 1x1 image is the smallest possible raster image. It can be stored in PNG, GIF, or JPEG, though lossless formats are preferred for pixel-perfect color. File sizes are typically a few bytes, depending on metadata and compression.

Limitations and privacy: Because a 1x1 pixel image can be used for tracking, it raises privacy concerns. Users can block or filter tracking pixels with browser settings, extensions, or privacy-focused tools.

See also: tracking pixel; pixel; raster graphics; image file formats.