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when toggle format what by license comment
May 6, 2010 at 19:24 comment added jonalm Thanks for the input. But I do need the linearity of the transformation (see the edit of my question), and that is not the case according to wikipedia.
May 6, 2010 at 16:45 comment added S. Carnahan You can also find the answer at en.wikipedia.org/wiki/…
May 6, 2010 at 15:47 history answered Vectornaut CC BY-SA 2.5