http://www.gateway2000.com/support/custserv/glossary/fileformat/j.htm (Amiga Plus Extra No. 5/97, 05/1997)| .jas | Compressed image files for 24 bit color and 8 bit gray scale images made by JASC. | |
| .jbig | Joint Bilevel Image Group format. A lossless method for compressing black and white (1-bit) raster image data. | |
| .jfi .jfif |
JPEG File Interchange Format. A data stream-oriented file format used to define the transmission of JPEG-encoded bitmap data. | |
| .jis | Japanese Industry Standard. Japanese code conversion program for text. | |
| .jpc | Japan Picture format. A type of bitmap. | |
| .jpg, .jpeg | Joint Photographic Experts Group file format. Compressed image file. |
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