- Compression is the elimination of data to reduce file size.
- Elimination of pixels will happen mostly.
- There are two types of compression. 1. Loseless compression.
- In lossless compression all original data can be recovered when the file is uncompressed.
- In lossy compression compression reduces a file by permanently eliminating certain information(we can say it as excess info).
- In loseless all the information is completed restored(every single bit of data) when uncompressed.
- In lossy only a part of the original information is still there when uncompressed.
- Graphics Interchange File(GIF) is an image format used on the web that provides loseless compression.
- JPEG image file, commonly used for photographs and other complex still images on the web that has lossy compression.
- Lossless compression is generally used for spreadsheet files for example spreadsheet might contain finance accounts etc.
- Lossy compression is generally used for video and sound, where a certain amount of information loss will not be detected by most users.
2. Lossy compression.
Image showing lossless and lossy uncompressed files.
Notes
