JPEG, BMP, GIF, PCX, PDF, RAW, PICT, PNG, TIFF, what's the difference between these image formats? Can you be specific?

JPEG pictures store a single raster image in 24-bit color. JPEG is a platform-independent format, which supports the highest level of compression. However, this compression is lossy. Progressive JPEG files support interleaving. You can increase or decrease the level of JPEG file compression. However, the file size is at the expense of JPEG image quality.

BMP is short for English Bitmap, which is a standard image file format in Windows operating system and can be supported by many Windows applications. The characteristic of this format is that it contains rich image information and hardly compresses it, but this leads to its inherent defect-occupying too much disk space. Therefore, BMP is popular on single computers at present.

the original meaning of GIF (graphics interchange format) is "image interchange format", which is an image file format gif developed by CompuServe company in 1987. The data of GIF file is a lossless compression format of continuous tone based on LZW algorithm. Its compression ratio is generally around 5%, and it does not belong to any application. At present, almost all related software supports it, and a large number of software in the public domain are using GIF image files.

PCX format is a format developed by ZSOFT company when it is developing the image processing software Paintbrush. It is a special format for PC-based drawing programs and is supported by general desktop typesetting, graphic arts and video capture software. PCX supports 256-color palette or full 24-bit RGB, and the maximum image size is 64K*64K pixels. CMYK or HSI color mode is not supported, and its compression method is inefficient, especially for scanned images or video images.

pdf (short for portable document format, meaning "portable file format") is a file format developed by Adobe Systems for file exchange in 1993. Its advantages are cross-platform, keeping the original Layout of files, opening standards, and Royalty-free development of PDF-compatible software.

the original meaning of p>RAW is "unprocessed". It can be understood as: RAW image is the original data that CMOS or CCD image sensor converts the captured light source signal into digital signal. RAW file is a file that records the original information of digital camera sensor and some original data (such as ISO setting, shutter speed, aperture value, white balance, etc.) produced by camera shooting. RAW is an unprocessed and uncompressed format, which can be conceptualized as "original image coded data" or more vividly called "digital negative". PICT format, as an intermediate file format for transferring images between applications, is widely used in Mac OS graphics and page layout applications.

PICT format supports RGB images with single Alpha channel and images in indexed color, grayscale and bitmap modes without Alpha channel. PICT format is particularly effective in compressing images containing large areas of solid color. For Alpha channels with large black and white areas, this compression effect is amazing.

png format is a lossless compressed bitmap graphics file format. PNG format is lossless compression, allows the use of palette technology similar to GIF format, supports true color images, and has the characteristics of alpha channel (semitransparent). Nowadays, many people use PNG format on the Internet and other aspects. The English name of PNG is Portable Network Graphics, which means portable network picture.

TIFF format is a Tagged Image File Format (abbreviated as tiff), which is mainly used to store images including photos and artistic drawings. It was originally developed by Aldus Company and Microsoft Company for PostScript printing. TIFF has become a popular high-bit color image format together with JPEG and PNG.