<p>Hey gophers,</p>
<p>I've written quickly a tiny app for mocking media structures for your dev env. </p>
<p>Works so far so good but I've noticed that the output JPG images have a pretty huge file size despite I've set the quality for JPEG encoding to 1.</p>
<p>Source: <a href="https://github.com/SchumacherFM/mediamock/blob/master/csv.go#L80" rel="nofollow">https://github.com/SchumacherFM/mediamock/blob/master/csv.go#L80</a></p>
<p>The code mocks e.g. an image 7456 × 5184 pixels, containing only one color, and results in a file size of 605kb.
If I pass the image file to <a href="https://imageoptim.com/" rel="nofollow">https://imageoptim.com/</a> the filesize drops to 114kb.</p>
<p>Is there any chance to achieve an nearly equal file size of 114kb with Go?</p>
<p>Thx!</p>
<hr/>**评论：**<br/><br/>dtfinch: <pre><p>I think the problem is that Go's <a href="https://golang.org/src/image/jpeg/writer.go" rel="nofollow">encoder</a> uses a pregenerated huffman table (allowing single-pass encoding), instead of doing another pass to construct an optimal table. Fine for everyday photos, but not for more highly compressible images. I think you just need to us another encoder.</p>
<blockquote>
<p>// This encoder uses the same Huffman encoding for all images.</p>
</blockquote></pre>schumacherfm: <pre><p>Ok, I thought so ... currently not in the mood to rewrite the encoder 8-)
Thanks!</p></pre>hayzeus: <pre><p>You could just spawn off imagemagick if you want some flexibility. There are also go bindings, but I think that gets you into cgo</p></pre>
