Pngquant – Lossy PNG compressor

You should showcase at least a single sample of a compressed vs uncompressed image right there on the first page, before the Features section.

WOW!!! I just applied this to the (big) PNG sprite files used in a project I am working on now, and the gains in file size were amazing! And with hardly any difference in quality!<p>Who ever said that reading Hacker News was a productivity drain?

shameless self-promotion:<p>demo: <a href="http://o-0.me/RgbQuant/" rel="nofollow">http:&#x2F;&#x2F;o-0.me&#x2F;RgbQuant&#x2F;</a><p>repo: <a href="https://github.com/leeoniya/RgbQuant.js" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;leeoniya&#x2F;RgbQuant.js</a><p>* doesnt support alpha channel or dithering (yet)

pngquant is great. I make an iPhone app that displays transit maps. Transit maps are ideal candidates for quantization (limited color range, large blocks of color that are perfect for RLE) and I saved a lot of file size by quantizing the map tiles. Thanks pngquant!

I&#x27;ve never quite understood how its possible to create better encoders without needing a new decoder on the other end. Can anyone explain how this works? When you&#x27;re writing a png decoder, why wouldn&#x27;t there just be one optimal png encoder to go along with it?

As kraken.io, we can safely say that this is indeed an excellent program, and it makes up part of our lossy PNG optimization stack.

How is this different from `pngnq` (that&#x27;s been around for ages)?

How about Color Quantizer? I use it for years. <a href="http://www.softpedia.com/get/Multimedia/Graphic/Graphic-Others/Color-quantizer.shtml" rel="nofollow">http:&#x2F;&#x2F;www.softpedia.com&#x2F;get&#x2F;Multimedia&#x2F;Graphic&#x2F;Graphic-Othe...</a><p>Offical site <a href="http://x128.ho.ua/color-quantizer.html" rel="nofollow">http:&#x2F;&#x2F;x128.ho.ua&#x2F;color-quantizer.html</a>

Some examples would be nice.

This is how I use pngquant in my thumbnailing workflow: <a href="https://gist.github.com/gigablah/3110899" rel="nofollow">https:&#x2F;&#x2F;gist.github.com&#x2F;gigablah&#x2F;3110899</a><p>At 100x100 pixels, I find that this produces small (~8kb) PNG thumbnails which are still sharp with no noticeable color loss.<p>(Disclaimer: I&#x27;m a beginner at nodejs)

Available in Homebrew:<p><pre><code> brew install pngquant</code></pre>

Read more about the details of implementing something like this in C#:<p><a href="http://www.mattwrock.com/post/2011/09/05/Convert-32-bit-PNGs-to-high-quality-8-bit-PNGs-with-C.aspx" rel="nofollow">http:&#x2F;&#x2F;www.mattwrock.com&#x2F;post&#x2F;2011&#x2F;09&#x2F;05&#x2F;Convert-32-bit-PNGs...</a>

The ImageOptim&#x2F;ImageAlpha OS X apps are fantastic for compressing all kinds of images for the web.<p><a href="http://imageoptim.com/" rel="nofollow">http:&#x2F;&#x2F;imageoptim.com&#x2F;</a> <a href="http://pngmini.com/" rel="nofollow">http:&#x2F;&#x2F;pngmini.com&#x2F;</a>

Very timely, I was just working on a page that had to display complex graphs and the regular PNG&#x27;s were huge. I set the quality to 50% and it reduced the size to about 30% of the original and it still looks good. Thank you!

Use ImageAlpha as a GUI for OSX. Very nice results!<p><a href="http://pngmini.com/" rel="nofollow">http:&#x2F;&#x2F;pngmini.com&#x2F;</a>

Lossy PNG compression is like trying to use a Ferrari to pull a 35 tonne trailer.<p>PNG is for graphics; JPEG is for photos.

I like this small program , great for compressing png files. Congrats dev.

Anyone knows of a similar tool for jpeg images?

Any link to the 2.0 32bit deb?

The algorithms link is broken.