pixbuf color count

[Kevin DeKorte <kdekorte gmail com>]

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Hello,

Once I have loaded a pixbuf using

gdk_pixbuf_new_from_file(filename, &error);

Is there a way to get the number of unique colors in that pixbuf. I
looked at the docs for ColorMap and it says it only applies to pseudo
color images, but I'm not even sure how that would apply in this case.

Basically, I just want to know if the image has only a couple of colors
in it or more.

Thanks,

Kevin
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