From: Eddie Du <lists@...>
Date: 2012-09-06T04:53:38+09:00
Subject: Re: Transparency not working on my Mac. Help!

I realized that sq.alpha was turned off. I turned it on with 
sq.alpha(Magick::ActivateAlphaChannel) and it worked :)

See http://www.imagemagick.org/RMagick/doc/image1.html#alpha

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