Bugs item #2905446, was opened at 2009-11-28 21:26 Message generated for change (Tracker Item Submitted) made by sistisette You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=507079&aid=2905446...

Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: Pixes (pix_ objects) Group: None Status: Open Resolution: None Priority: 5 Private: No Submitted By: Matteo Sisti Sette (sistisette) Assigned to: Nobody/Anonymous (nobody) Summary: [DOCUMENTATION] pix_mask documentation error

Initial Comment: The help-patch for pix_mask contraddicts itself: statement 1: "Where ever the mask has a colored pixel, the alpha component of the other image will be set to 0 (transparent)." statement 2: "Basically, the luminance-value of the right pix will become the alpha-value of the left pix."

These sentences obviously contraddict each other. According to statement 1, non-zero luminance would produce zero alpha, while according to statement 2 the opposite is true. Also, according to statement 1 at most 2 values of alpha would be possible (zero and non-zero, presumably 1), while according to statement 2, intermediate values in the range 0..1 seem to be possible.

I think the correct one is (2).

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