JPEG

The Joint Photographic Experts Group (JPEG) format is commonly used to display photographs and other continuous-tone images over the Internet. JPEG files retain all their color information in an RGB image and also use a compression scheme that effectively reduces file size by identifying and discarding nonessential image display data.

 

Because it discards data, the JPEG compression scheme is referred to as “lossy.” Once an image has been compressed and then decompressed, it will not be identical to the original image. A high level of compression will result in lower image quality, while low compression levels result in higher quality images.

 

Exporting JPEG files

export_opts_jpeg.tiff
The JPEG export options.

The content of a form•Z window is exported as a JPEG file in the standard manner. The Export Options: JPEG dialog, in addition to the common options contains one format specific option.

 

Quality Factor: The items in this pop up menu specify which JPEG compression scheme will be used when exporting. Selecting the maximum quality setting, 5 (High), will produce the best image, but will result in a larger file size. Selecting the lowest setting, 1 (Medium), will produce the lower quality image, but will result in a smaller file size. The default setting is 2.

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