<story><title>QOI – The Quite OK Image Format</title><url>https://qoiformat.org/</url></story><parent_chain></parent_chain><comment><author>bscphil</author><text>&amp;gt; It losslessy compresses images to a similar size of PNG&lt;p&gt;It&amp;#x27;s worth pointing out that in cases where PNG is still the most reasonable format to use, compression gains are frequently left on the table. I frequently see 20-30% additional compression with tools like ect (&amp;quot;efficient compression tool&amp;quot;), oxipng, and zopflipng, and that&amp;#x27;s starting with images that are already pretty well compressed (using the strongest settings available from traditional PNG libraries). In other words, even PNG compresses better than PNG. :-)&lt;p&gt;Case in point: I downloaded the sample images in the zip on the page and recompressed them with ect. It took only a few seconds, but 4 of the 7 sample images could be further compressed by more than 33%! After compressing them as much as I could achieve, the resulting PNG images were only 77% the size of the QOI images. Compression gains of 23% are nothing to sneeze at when it comes to lossless compression.&lt;p&gt;Of course, that&amp;#x27;s not to say that something like QOI wouldn&amp;#x27;t be useful. Even if it wasn&amp;#x27;t, I do love seeing tiny but effective implementations of algorithms like this - well done.</text></comment>
<story><title>QOI – The Quite OK Image Format</title><url>https://qoiformat.org/</url></story><parent_chain></parent_chain><comment><author>graderjs</author><text>I just read the PDF spec. That&amp;#x27;s awesome!&lt;p&gt;I particularly like the four 2-bit tags that allow you to encode: runs of a previously seen pixel, or a color Delta (big or small), or a previously seen pixel.&lt;p&gt;Plus, the simple hash function of previously seen pixels (inner product of rgba and the first four odd primes) based on their color values, into a 64 slot array, it&amp;#x27;s just really nice.&lt;p&gt;It&amp;#x27;s so refreshing to see one page specification. it just comes across as really elegant. Almost a work of art and has a certain aesthetic to it that I really like. It&amp;#x27;ll be cool to see more people creatively inventing standards. It&amp;#x27;s a worthwhile pursuit not because you think okay we&amp;#x27;re going to create a standard that&amp;#x27;s going to
take over some other standard...nor a proliferation. But a file format a specification is a valid sort of medium of creative expression and output. It&amp;#x27;s a valid creative product I think. So it&amp;#x27;s just really really cool to see this!</text></comment>