本建议|国际标准定义了一组无损（保位）和几乎无损（其中 每个重构样本的误差由一个预定义值限定）编码连续音调的压缩方法， 灰度或彩色数字静止图像。 本建议|国际标准 ? 指定将源图像数据转换为压缩图像数据的过程； ? 指定将压缩图像数据转换为重建图像数据的过程； ? 指定压缩图像数据的编码表示； ? 就如何在实践中实施这些流程提供指导。

This Recommendation | International Standard defines a set of lossless (bit-preserving) and nearly lossless (where the error for each reconstructed sample is bounded by a pre-defined value) compression methods for coding continuoustone, gray-scale, or colour digital still images. This Recommendation | International Standard ? specifies a process for converting source image data to compressed image data; ? specifies processes for converting compressed image data to reconstructed image data; ? specifies coded representations for compressed image data; ? provides guidance on how to implement these processes in practice.