loss and lossless compression

• JPEG (Joint Photographic Experts Group) is an example of lossy image compression that uses DCT (Discrete Cosine Transform).
• The goal of lossy compression is to reduce file size while minimizing information loss.
• Lossy compression is used when the original data can be reconstructed from compressed data.
• MP3 (MPEG-1 Audio Layer III) is the most popular format used to compress music files.
• Lossy audio compression techniques include MP3, AAC, WMA, and Ogg Vorbis.
• Lossy compression can be used on images, audio files, videos, and text documents.
• AAC (Advanced Audio Coding) is another widely used audio compression technique.
• In JPEG compression, the original image is divided into blocks of pixels called macroblocks.
• Lossy compression reduces file sizes by removing insignificant bits, resulting in smaller files with less detail.
• Each block undergoes a Discrete Cosine Transform (DCT), which converts it from pixel values to coefficients representing its frequency components.
• Lossy compression is commonly used for images, audio, and video because it allows for significant reductions in file size without noticeable quality degradation.