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Imagemagick is a cross-operating-system bitmap manipulation software package, run from commandline and programmable through a variety of programming languages.

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How to convert a specified colour to transparent for a series of PNGs with ImageMagick?

I've installed ImageMagick on Windows 7 64-bit and I'm wondering how I can convert a series of PNGs to transparent PNGs in a timely manner (I have 180 PNGs to convert, so yeah I can't exactly do them each … How can I quickly edit the transparency of a colour for a batch of PNGs using ImageMagick? …
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