On Feb 19, 12:13 am, "Gabriel Genellina" <[EMAIL PROTECTED]>
wrote:
> En Tue, 19 Feb 2008 04:01:04 -0200, vaneric <[EMAIL PROTECTED]>
> escribió:
>
> > On Feb 19, 1:38 am, Robert Kern <[EMAIL PROTECTED]> wrote:
> >> Averaging color
> >> images is tricky; you really shouldn't do it in the RGB colorspace.
>
> > hi,
> > thanx for the guidance and detailed replies..I tried to pack the
> > r,g,b into a single value like below(something a member posted in the
> > past)
>
> > def rgbTopixelvalue((r,g,b)):
> > alpha=255
> > return unpack("l", pack("BBBB", b, g, r, alpha))[0]
>
> That's much worse than averaging the R,G,B components. First, you have to
> omit the alfa value (or set it at the end). Then, consider this example:
> (0,0,0)=black and (0,1,0)=almost black, average = (0,0,128)
How do you arrive at that average?
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