ISO7IEC 15444-2:20 23本文档定义了一组用于编码连续色调、双层、灰度、彩色数字静态图像或多分量图像的无损（比特保留）和有损压缩方法。 本文件: -指定用于将压缩图像数据转换为重构图像数据的扩展解码过程； -指定包含用于解释压缩图像数据的信息的扩展码流语法； -指定扩展文件格式； -指定用于存储图像元数据的容器； -定义图像元数据的标准集合； -提供关于用于将源图像数据转换为压缩图像数据的扩展编码过程的指导； -就如何在实践中实施这些流程提供指导。

ISO7IEC 15444-2:2023 This document defines a set of lossless (bit-preserving) and lossy compression methods for coding continuous-tone, bi-level, grey-scale, colour digital still images, or multi-component images.
This document:
- specifies extended decoding processes for converting compressed image data to reconstructed image data;
- specifies an extended codestream syntax containing information for interpreting the compressed image data;
- specifies an extended file format;
- specifies a container to store image metadata;
- defines a standard set of image metadata;
- provides guidance on extended encoding processes for converting source image data to compressed image data;
- provides guidance on how to implement these processes in practice.