Definition - What does Image Compression mean?
Image compression is the process of encoding or converting an image file in such a way that it consumes less space than the original file.
It is a type of compression technique that reduces the size of an image file without affecting or degrading its quality to a greater extent.
Techopedia explains Image Compression
Image compression is typically performed through an image/data compression algorithm or codec. Typically such codecs/algorithms apply different techniques to reduce the image size, such as by:
- Specifying all similarly colored pixels by the color name, code and the number of pixels. This way one pixel can correspond to hundreds or thousands of pixels.
- The image is created and represented using mathematical wavelets.
- Splitting the image into several parts, each identifiable using a fractal.
Some of the common image compression techniques are:
- Chroma sub sampling
- Transform coding
- Run-length encoding