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JPEG Optimization

JPEG is the compression algorithm used in JFIF (JPEG File Interchange Format) files, commonly known as JPEG. JPEG was designed by the Joint Photographic Experts Group to compress realistic true-color or grayscale images, such as photographs or fine artwork. It does not work well on scanned text, comic strip art, or line art because these have hard edges and areas of flat color, which are better suited for GIFs or PNGs.

JPEG supports 256 color grades (8 bit) per color channel. This equals 24 bits per pixel in color mode (16 million colors) and 8 bits per pixel in grayscale. Grayscale images are thus smaller than their full-color counterparts.


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