[Image-SIG] Help colors

[Oliver Albrecht]

Greetings,
I'm new to Python and trying to use PIL to:

- Wich Colorreduce Method used PIL other as "Web"?
	"Octree" , "Median" ?

- Why has the GIF format double size?  (I use PSP as Graphic-program )
- How discover the nearest color?
	x= (r1,g1,b1) - (r,g,b)
	y= (r2,g2,b2) - (r,g,b)
	if pos(x) > pos(y): nearest=y
	else: nearest=x

I want make a script to switch the colorpalette from images.
	# numerate all pixel(palette_Id)
	MapL=list(enumerate(data_list))
	# turn round nr/palette_Id
	MapL= [(b, [a]) for a, b in MapL]
	MapL.sort()
	Listshort=[("",[""])]
	# delete all double palette_Id but put the key(nr) to it
	for value, key in MapL:
     		if value != Listshort[-1][0]:
         		Listshort.append((value,key))
     		else:
         		Listshort[-1][1].extend(key)
	Listshort=sorted(Listshort[1:])

	# now load a other palette and compare this
	sorted(palette1,palette2)

	# then switch the palette_Ids in Listshort and reinsert it as im.data

If it give another, better way tell it me. else i will post the
completed script.

tiny-fault-report:
I think in the PIL-Beta-Docu this Example is an fault.
http://effbot.org/imagingbook/imagepalette.htm

##Getting the Palette Contents Using Resize/Convert
assert im.mode == "P"

lut = im.resize((256, 1))
lut.putdata(range(256))
lut = im.convert("RGB").getdata()
       ^^
# lut now contains a sequence of (r, g, b) tuples

"lut" has the sequence from "im" but not from "lut.putdata(range(256))"
"lut" is a copy from "im" but "im" is not resized.
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