Definitions for "Progressive JPEG"
A JPEG format where the image information is gradually downloaded. That is, a full-size, low-quality image initially appears, followed by successive passes that improve the image's quality. A progressive JPEG file takes no longer to download than a traditional JPEG file, and the end user can get a good idea of what the final image will look like with only 25 percent of the image downloaded.
A JPEG file format used to display an image progressively in steadily increasing resolutions as data is downloaded in a browser.
an image that displays progressively in a Web browser. The image will display as a series of overlays, enabling viewers to see a low-resolution version of the image before it downloads completely.