Martin wrote:
Dear group
I'm trying to use PIL to write an array (a NumPy array to be exact) to
an image.
Peace of cake, but it comes out looking strange.
I use the below mini code, that I wrote for the purpose. The print of
a looks like expected:
[[ 200. 200. 200. ..., 0. 0. 0.]
[ 200. 200. 200. ..., 0. 0. 0.]
[ 200. 200. 200. ..., 0. 0. 0.]
...,
[ 0. 0. 0. ..., 200. 200. 200.]
[ 0. 0. 0. ..., 200. 200. 200.]
[ 0. 0. 0. ..., 200. 200. 200.]]
But the image looks nothing like that.
Please see the images on:
http://hvidberg.net/Martin/temp/quat_col.png
http://hvidberg.net/Martin/temp/quat_bw.png
or run the code to see them locally.
Please – what do I do wrong in the PIL part ???
:-? Martin
import numpy as np
from PIL import Image
from PIL import ImageOps
maxcol = 100
maxrow = 100
a = np.zeros((maxcol,maxrow),float)
for i in range(maxcol):
for j in range(maxrow):
if (i<(maxcol/2) and j<(maxrow/2)) or (i>=(maxcol/2) and j>=
(maxrow/2)):
a[i,j] = 200
else:
a[i,j] = 0
print a
pilImage = Image.fromarray(a,'RGB')
You are telling it the wrong mode information. If you want an RGB image, you
need to give it a uint8 array with shape (height, width, 3). Exactly what are
you trying to do? I can't infer that from your code.
--
Robert Kern
"I have come to believe that the whole world is an enigma, a harmless enigma
that is made terrible by our own mad attempt to interpret it as though it had
an underlying truth."
-- Umberto Eco
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