DownloadQuantizes a 32-bit RGBA PNG image to an 8 bit RGBA palette PNG
using the neuquant algorithm.
Categories
Image ConvertersLicense
BSD LicenseFollow pngnq
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User Reviews
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Great program with lots of useful tools.
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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.
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An essential image processing tool!