Hi there,
I am confused of the PIL code, I tried to write a custom non-linear filter
that's the reason why I took a look.
Can someone give me a hint how this works:
ImageFilter.py, class RankFilter:
In the method "filter" which takes an image (which is obviously an Image()?) a
method "image.rankfilter" is called. I cannot call this method on an image I
e.g. loaded from a file and can't find it elsewhere in the code.
$ fgrep rankfilter *
returned only this file and on a *.so. Is that the key? Does "rankfilter" call
a C-function which cannot be found in Python-code?
The other thing I originally planned was to write an own filter. I started
with:
####
import Image
from ImageFilter import *
class BinomialFilter(Filter):
name = "BinomialFilter"
def __init__(self, scale=1):
self.scale = 16
self.offset = 1
self.filtermatrix = [[1, 2, 1],[2, 4, 2],[1, 2, 1]]
def filter(self, image):
# convert to grayscale
im = image.convert("L")
return im
im = Image.open("/tmp/pic.jpg")
im.filter(BinomialFilter()).show()
###
which I thought should return me a grayscale image. But it returns a coloured
image. What's wrong here?
Thank you for any advice,
Regards,
Philipp Bender
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