After artifacting, the image or audio/video file will appear “noisy”. An image or video with noise can be fuzzy or lacking in colour. This happens because of a lossy data compression method. While a major portion of data of the original file is removed during the process of lossy data compression, the remaining file can offer a comprehensive picture.
In lossy data compression, some specific data of a file is lost.
The basic concept is that some unnecessary or redundant information is removed to make the remaining data more simplified and easily stored in limited storage space or streamed across a constrained bandwidth (with a specific data rate or bit rate). In general, the media which is compressed via lossy compression technique offers a compressed media file of lower quality. This compression technique is often used in cases where the big files are required to be stored or streamed to offer specific data or information for specific purposes. For example, a picture of jpg file might contain very minute details which aren’t perceivable with naked human eyes. Removing those details allows the image to be stored in less space, or streamed at a lower bit rate. However when the image is reproduced at a larger size, these missing details may become visible as noise or blurry sections.
Audio files created with lossy compression may sound noisier than the original depending on the bit rate used.
When creating files for streaming, always be sure to check the bit rates to be used so your files will look and sound as good as they can for the chosen circumstances.« Back to Glossary Index