[sugar] how to make a grayscale image?

[Benjamin M. Schwartz]

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Erik Blankinship wrote:
> Anyone know of an easy technique for turning a pixbuf or cairo context
> into grayscale?

I can't tell what you mean.  Do you mean to take a snapshot of an existing
pixbuf, convert that snapshot to grayscale, and display the snapshot over the
existing pixbuf?  If so, the easiest way I know of is
gtk.gdk.Pixbuf.get_pixels_array and gtk.gdk.pixbuf_new_from_array [1].  These
methods allow you to do math on the pixels as a Numeric Python array, and then
make a new Pixbuf from the resulting array.

1.
http://www.pygtk.org/docs/pygtk/class-gdkpixbuf.html#method-gdkpixbuf--get-pixels-array
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