pngnq

Posted by Linda Hudson — 2013-04-30

Great program with lots of useful tools.
Posted by Jacob — 2012-10-29

small and efficient and gets the job done.
Posted by william hartman — 2012-09-15

simple and straight forward to use
Posted by Ryan Fogarty — 2012-04-09

Checked to see how this library would quantize a RGBA true color image. This is for rendering scientific data that has up to 512 levels (or ~9 bit pallette, single hue from black to white), which is of course very limited, but where 1/3 to 1/5 of the data has variable alpha. It is a little slow taking ~8-10 sec to convert a 1024x1024 image (that I'm sure is fine for most purposes), but it does an amazing job building a PNG8 that is indistinguishable from the original image.
Posted by Blake — 2012-03-25

pngnq works great
Posted by Chris Dunphy — 2011-01-02

An essential image processing tool!

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