JPEG images use a variable quality level to control the amount of compression. A low-quality image results in a smaller JPEG file; a high-quality image generates a relatively large file. The amount of JPEG compression is typically measured as a percentage of the quality level. An image at 100% quality has (almost) no loss, and 1% quality is a very low-quality image. In general, quality levels of 90% or higher are considered "high quality", 80%-90% is "medium quality", and 70%-80% is low quality. Anything below 70% is typically a very low-quality image.