blocks|key|3077295|text|在Mac上，我用ImageOptim取得了很好的成功。它以拖放的方式处理PNG、JPEG和GIF文件，还可以处理整个目录。它也是开源的，有多种语言版本。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3077296|在Windows上，我同时使用了PngOptimizer和PNGGauntlet。与ImageOptim不同的是，这些程序会将其他格式转换为PNG，所以如果你的目标是减少GIF或JPEG，并使其保持该格式，这些将不是一个选择。|3077297|您也可以尝试雅虎网站/服务smush.it，它可以处理单个文件上传以及目录压缩。|3077298|entityMap|0|LINK|mutability|MUTABLE|url|http://imageoptim.com/|1|http://psydk.org/PngOptimizer|2|http://pnggauntlet.com/|3|http://smush.it/^0|8|A|0|0|G|C|1|T|B|2|0|D|8|3|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@$A|W|B|X|1|Y]]|C|$]]|$1|D|3|E|5|6|7|Z|8|@]|9|@$A|10|B|11|1|12]|$A|13|B|14|1|15]]|C|$]]|$1|F|3|G|5|6|7|16|8|@]|9|@$A|17|B|18|1|19]]|C|$]]|$1|H|3|-4|5|6|7|1A|8|@]|9|@]|C|$]]]|I|$J|$5|K|L|M|C|$N|O]]|P|$5|K|L|M|C|$N|Q]]|R|$5|K|L|M|C|$N|S]]|T|$5|K|L|M|C|$N|U]]]]

On the Mac, I've had good success with <a href="http://imageoptim.com/" rel="nofollow">ImageOptim</a>. It handles PNG, JPEG, and GIF files in a drap &amp; drop manner and can also process entire directories. It's also open-source and available in multiple languages.

On Windows, I've used both <a href="http://psydk.org/PngOptimizer" rel="nofollow">PngOptimizer</a> and <a href="http://pnggauntlet.com/" rel="nofollow">PNGGauntlet</a>. Unlike ImageOptim, these programs will convert other formats to PNG, so if your goal is to reduce a GIF or JPEG and have it stay in that format, these won't be an option.

You could also try the Yahoo web site/service <a href="http://smush.it/" rel="nofollow">smush.it</a> which can handle single file uploads as well as a directory zip.

blocks|key|2154572|text|最好的无损压缩网络图像的工具是FileOptimizer。它有时可以将图像压缩到原始大小的10%25。一些更好的在线工具是PNG的this+compressor和JPG的this+one。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2154573|不过，如果你有很多图片，我还是会用FileOptimzer。如果你只有几个，那么使用在线工具会更容易。|2154574|entityMap|0|LINK|mutability|MUTABLE|url|http://nikkhokkho.sourceforge.net/static.php?page=FileOptimizer|1|http://www.giftofspeed.com/png-compressor/|2|https://kraken.io/web-interface^0|F|D|0|1R|F|1|2B|8|2|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@$A|S|B|T|1|U]|$A|V|B|W|1|X]|$A|Y|B|Z|1|10]]|C|$]]|$1|D|3|E|5|6|7|11|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|12|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]|N|$5|I|J|K|C|$L|O]]|P|$5|I|J|K|C|$L|Q]]]]

The best tool for losslessly compressing images for the web (JPG, PNG and GIF) is <a href="http://nikkhokkho.sourceforge.net/static.php?page=FileOptimizer" rel="nofollow">FileOptimizer</a>. It can compress images up to 10% of its original size sometimes. A few of the better online tools are <a href="http://www.giftofspeed.com/png-compressor/" rel="nofollow">this compressor</a> for PNG's and <a href="https://kraken.io/web-interface" rel="nofollow">this one</a> for JPG's.

I would go with the FileOptimzer if you have a lot of images though. If you have just a few it's easier to use the online tools.

blocks|key|5191909|text|GIF、PNG甚至JPEG无损优化都是可能的。因为，这些格式包含了足够的冗余。至于PNG格式，我使用的是cryopng脚本。你可以在here上找到其他一些与压缩相关的东西。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|5191910|entityMap|0|LINK|mutability|MUTABLE|url|http://encode.ru/threads/1260-CryoPNG-short-introduction|1|http://www.encode.ru/^0|1G|7|0|1U|4|1|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]|$A|R|B|S|1|T]]|C|$]]|$1|D|3|-4|5|6|7|U|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]|L|$5|G|H|I|C|$J|M]]]]

GIF, PNG and even JPEG lossless optimization is possible. Because, these formats includes enough redundancy. As to PNG format, I use <a href="http://encode.ru/threads/1260-CryoPNG-short-introduction" rel="nofollow">cryopng</a> script. You can find some other compression related things at <a href="http://www.encode.ru/" rel="nofollow">here</a>.

blocks|key|247700|text|我最近开始使用无损Jpegoptim+(GitHub)，我用这个工具得到了最好的结果，经常接近Google+Page+Speed建议，有时甚至更好。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|247701|我在Linux上，所以如果我导航到包含图像的文件夹，我只需使用以下命令来压缩所有图像：|247702|jpegoptim+*.jpg+-s|code-block|syntax|javascript|247703|或者，如果您只想压缩特定的图像，请使用此命令：|247704|jpegoptim+image.jpg+-s|247705|它基本上从输出文件中剥离了所有的标记，有时甚至可以减少50%25的图像大小！图像质量保持不变。|247706|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/tjko/jpegoptim^0|K|6|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@$A|Z|B|10|1|11]]|C|$]]|$1|D|3|E|5|6|7|12|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|13|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|14|8|@]|9|@]|C|$]]|$1|M|3|N|5|H|7|15|8|@]|9|@]|C|$I|J]]|$1|O|3|P|5|6|7|16|8|@]|9|@]|C|$]]|$1|Q|3|-4|5|6|7|17|8|@]|9|@]|C|$]]]|R|$S|$5|T|U|V|C|$W|X]]]]

I recently started using lossless Jpegoptim (<a href="https://github.com/tjko/jpegoptim" rel="nofollow noreferrer">GitHub</a>) and I get the best results with this tool, very often close to Google Page Speed suggestions and sometimes even better.

I'm on Linux so if I navigate to the folder with the images I simply use this command to compress all images:

<pre><code>jpegoptim *.jpg -s
</code></pre>

Or use this if you want to compress only specific image:

<pre><code>jpegoptim image.jpg -s
</code></pre>

It basically strips all the markers from the output file which can sometimes reduce the image size even for 50%! The image quality stays the same.

blocks|key|5192110|text|我目前使用的是highcompress，这是我最喜欢的，因为最好的部分是质量和大小。我已经比较了许多在线工具，在大多数情况下，它提供了最好的压缩和最好的质量，所以现在我不会到处去直接使用它。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|5192111|entityMap|0|LINK|mutability|MUTABLE|url|http://www.highcompress.com/^0|7|C|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

I am currently using <a href="http://www.highcompress.com" rel="nofollow noreferrer">highcompress</a> and this one is my favorite because the best part is quality and size. I have compared with many online tools and in most of the cases it gives best compression and best quality so now I don't go here and there and directly use this. If any other better you know kindly share

Running <a href="https://developers.google.com/speed/" rel="nofollow noreferrer">Google Page Speed</a> on a public site , I saw some suggestions by the tool like the following :

Losslessly compressing <a href="http://g-ecx.images-amazon.com/images/G/01/electronics/detail-page/Acer-120x120._V137848950_.gi" rel="nofollow noreferrer">http://g-ecx.images-amazon.com/images/G/01/electronics/detail-page/Acer-120x120._V137848950_.gi</a> could save 4.8KiB (26% reduction) and they also provide a link to the optimized content.But they do it on a per image basis. I saw some significant reduction on file sizes after compression. So the question is :

Is there any tool or web service that I can use so that I give it a directory of uncompressed images(say .gif) and it returns me a directory of images with all of them compressed?

I found a somewhat related question on SO <a href="https://stackoverflow.com/questions/5451597/how-does-googles-page-speed-lossless-image-compression-work">here</a> but it is not an exact duplicate.

Thanks for reading.

Tool for lossless image compression

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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在一个公共站点上运行时，我看到了该工具的一些建议，如下所示：无损压缩可以节省4.8KiB (减少26%)，而且它们还提供了到优化的content.But的链接，它们是在每个图像的基础上这样做的。在压缩后，我看到文件大小有了一些显着的减少。所以问题是：有没有什么工具或web服务可以让我给它一个包含未压缩图像的目录(比如.gif)，然后它会返回一个包含所有压缩图像的目录？我在SO 上发现了一个有点相关

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