http://developer.gnome.org/arch/imaging/gdkpixbuf.html
http://members.jcom.home.ne.jp/maegawa/linux/gdkpixbuf.html
http://www.limo.fumi2kick.com/tips/gtk_pixbuf/gtk_tips07.html
http://www.itmedia.co.jp/news/articles/0409/17/news006.html