Optimizing PNG images with OptiPNG

OptiPNG is a PNG optimizer that recompresses image files to a smaller size without losing any information. …

It is found in many distributions' package managers, so installation is easy. On a Mandriva box, that would be urpmi optipng as root.

Basic usage is as simple as optipng filename.png. See the manpage for advanced examples.

I like to add optipng as an editing option to gqview, my preferred thumbnail viewer. In gqview, open File – Preferences – Editors. In a blank menu entry, add (for example) "Optimize PNG" as a menu name and "optipng -fix -preserve -q %f" (or your preferred options) as the command line. Once configured, use is simple: right click on the image to be optimized (either the thumbnail or the large image) and select "Edit – in Optimize PNG".

Of the alternatives I tried, OptiPNG has the best documentation and gives me the smallest output sizes. But it it's not what you're looking for, there's also pngcrush and pngrewrite.

PNG is a fine format but it isn't a one-size-fits-all solution. Consider other formats as well.


About Warren Post

So far: Customer support guy, jungle guide, IT consultant, beach bum, entrepreneur, teacher, diplomat, over-enthusiastic cyclist. Tomorrow: who knows?
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