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PNG is a format for compressing and transferring images on the Internet, developed as a non-patented alternative to GIF. It supports palette-based, grayscale, and full-color images, with transparency and textual comments.
Learn about different types of image file formats, such as JPEG, PNG, GIF, and how they are compressed, stored, and used. Compare raster and vector formats, and see examples of common graphic file formats.
A comprehensive table of image file formats and their features, owners, extensions, and applications. Find out the differences and similarities between formats like JPEG, PNG, TIFF, and more.
A file signature, also known as a magic number or magic bytes, is data used to identify or verify the content of a file. This web page lists the hexadecimal signatures, ISO 8859-1 text representations, and file extensions of various file formats.
JPEG stands for Joint Photographic Experts Group, the name of the committee that created the JPEG standard in 1992. JPEG is a widely used method of compressing digital images, particularly for digital photography, with adjustable tradeoff between storage size and image quality.
To the right is an example of a file saved as JPEG when it should have been saved as PNG. JPEG uses lossy data compression meant for photographs. Compressing drawings or diagrams with JPEG results in an image of poor quality, because the human eye can spot the compression artifacts around the edges.
ImageMagick is a free and open-source software suite for displaying, creating, converting, modifying, and editing raster images. It can read and write over 200 image file formats, and supports various features such as color quantization, dithering, liquid rescaling, and artistic effects.
WebP is a raster graphics file format developed by Google that supports both lossy and lossless compression, as well as animation and alpha transparency. It is based on the VP8 video format and the Resource Interchange File Format (RIFF), and has a filename extension of .webp.
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