[Image-SIG] Re: Returning Colormap values for an image?

[Fredrik Lundh]

Alfred Milgrom wrote:

> Unfortunately I think I am missing something as far as the
> resize/convert technique is concerned. Basically I do not understand
> why all the colours will be preserved if the image is resized, nor why
> the colours will then be neatly arranged in the lut Image.

that's an interesting question: the example is broken, and you're the
first one who's noticed.  oops!  here's how it's supposed to look:

    lut = im.resize((256, 1))
    lut.putdata(range(256))
    lut = lut.convert("RGB").getdata()

(the resulting lut object is now a 256-item sequence of (r, g, b) tuples;
use list(lut) if you want to print it)

</F>