The .jpg format is best used for continuous tone images, such as photographs. It uses lossy compression, which means that some data is discarded to reduce the file size. Once a file is compressed with lossy compression, the original data cannot be recovered.
The Quality measure is the used to control the balance between the quality of the image and the reduction in the file size. The higher the Quality value, the less data is discarded. You must decide a balance between file size and image quality, which usually falls between 0 and 80. Values over 80 usually produce an increased file size with little visible improvement in image quality.
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