Compression is the technique used to reduce the size of something in this case, a file size on a computer to make it more easily usable. In digital graphics this is used for decreasing the file size of an image or object.
Lossy- This is a type of compression that deals with making the file size smaller with the side effect of reducing the quality. This happens due to part of the file being discarded to allow the file to be smaller.
JPEG is an example of a lossy file type as it can become blocky at high compression ratios.
Lossless - this is when a set of algorithms extracts the exact original data and reconstructs it with a compression.
PNG is an example of a lossless file type as the quality remains the same but with a decreased file size.
Effects of compression
The most obvious effects that can occur when compressing a file are loss of data and decreased quality.
This is an example of compression, as can be seen the image quality is drastically decreased as is the file size of the image. The clearest image is without compression, then a compression is applied and a loss of quality has occurred, this happens again when more compression is applied, with the increase in compression, the file size is decreased.
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