Applicable to continuous-tone grayscale or colour digital still image data. It is applicable to a wide range of applications which require use of compressed images. Defines extensions [including variable quantization, selective refinement, tiling, and a Still Picture Interchange File Format (SPIFF)] to processes for converting Source image data to compressed image data. Defines extensions to processes for converting compressed image data to reconstructed image data. Defines coded representations for compressed image data. Gives guidance and examples on how to implement these extensions in practice. Describes compliance tests for these extensions.
