库进一步(无损)Jpeg压缩 [英] Library for further (lossless) Jpeg-compression

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问题描述

我在寻找一个专门压缩Jpegs的库,而不改变图像。我发现PackJpeg,但它不提供任何源代码,你不能使用它的商业。

I'm looking for a library specialized at compressing Jpegs even further without changing the image. I've found PackJpeg but it doesn't provide any source code and you're not allowed to use it commercially.

推荐答案

PackJPG页面,有一个指向 JPEG开源开发包。它不包括PackJPG源代码,但是基本例程来处理和压缩JPG数据。这已用于开发 rejpeg ,这是一个开放源代码,并根据GPL v2授权。

On the PackJPG page, there's a link to the JPEG Open Source Developers Package. It doesn't include PackJPG source code, but basic routines to process and compress JPG data. This has been used to develop rejpeg which is open source and licensed under GPL v2.

Matthias Stirner在几天前发布了公告说他打算使PackJPG开源,并且正在考虑双重许可(GPL +对封闭源代码开发人员的特殊权限)。

Matthias Stirner has made an announcement some days ago that says he is going to make PackJPG open source and is thinking about a dual license (GPL + special permissions for closed source developers).

PAQ (开源,GPL许可证)从Matt Mahoney在几个变体实现JPEG压缩(不支持渐进图像,虽然)。在他的页面上,有一个表格,用于比较不同的计划。

There is PAQ (open source, GPL license) from Matt Mahoney in several variants that implement JPEG compression (doesn't support progressive images, though). On his page, there's a table comparing different programs.

完全免费的方法,您可以使用 libzpaq JPG压缩配置文件

For a completely free approach, you can use libzpaq together with the JPG compression configuration file.

引用libzpaq许可证:

Quoting the libzpaq license:


免费授予任何获得本软件和相关文档文件(
软件)的
a副本的人免费无限制地处理软件,包括
,不限制使用,复制,修改,合并,发布,
分发,再授权和/或出售本软件的副本,以及
许可证人没有
的限制。本软件按原样提供,没有保修。

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so without restriction. This Software is provided "as is" without warranty.

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