Small file size and high image quality are opposites. However, this compression degree is optionally selectable (with an option setting named JPG Quality in your editor), to be lower quality smaller files, or to be higher quality larger files. A smaller file, yes, there is nothing like JPG for small, but this is at the cost of image quality. JPG uses lossy compression to accomplish this feat, which has a strong downside. Digital cameras and web pages use JPG files, because JPG heroically compresses the data to be very much smaller in the file. JPG is the file extension for JPEG files (Joint Photographic Experts Group, a committee of ISO and ITU). JPG is the most used image file format.
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