<p><b>@tomhughes</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/openstreetmap/openstreetmap-website/pull/1696#discussion_r155179427">config/image_optim.yml</a>:</p>
<pre style='color:#555'>> -pngcrush: false
-advpng: false
-optipng: false
-pngquant: false
-jhead: false
-jpegoptim: false
-gifsicle: false
-jpegtran: false
+pngcrush: true
+advpng: true
+optipng: true
+pngquant: true
+jhead: true
+jpegoptim: true
+gifsicle: true
+jpegtran: true
</pre>
<p>It's probably easier (and more consistent) just to delete the lines - they all default to on anyway.</p>

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