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The pnmtopng package contains the official pnmtopng and pngtopnm utilities for use with the rest of the PBMplus/NetPBM suite. They are among the best PNG-supporting applications available, with automatic detection of grayscale or palette images and excellent heuristics for creating the smallest possible PNG images.

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System requirement is not defined
Information regarding Project Releases and Project Resources. Note that the information here is a quote from Freecode.com page, and the downloads themselves may not be hosted on OSDN.

2002-06-18 11:40
2.38

阿新调色板选项，支持自定义（有序）调色板，文本的语法注释文件现在更强大，标准输入/标准输出的DOS的衍生操作系统现在被迫二进制模式，以及潜在的内存泄漏和数量空指针错误是固定的。
标签: Minor feature enhancements
A new -palette option supports custom (ordered) palettes, the syntax of text-comment files is now more robust, stdin/stdout on DOS-derived OSes are now forced to binary mode, and a number of potential memory leaks and null-pointer bugs are fixed.

2001-01-30 15:13
2.37.3

最后两个版本包括改进的错误，其中包括一个错误造成的Solaris上与海湾合作委员会的核心转储编译修复处理。
The last two releases have included improved error-handling, including a fix for one bug that caused core dumps on Solaris with gcc compiles.

Project Resources

Project Page 下载: 变更日志 首页 下载: TGZ