the problem in pylab_examples example code: image_demo2.py

The 1st code snippet of image_demo2.py is as follows

#!/usr/bin/env python
from pylab import *
w, h = 512, 512
s = file('../data/ct.raw', 'rb').read()
A = fromstring(s, uint16).astype(float)
A *= 1.0/max(A)
A.shape = w, h
I replaced s = file('../data/ct.raw', 'rb').read() with s = file('/home/jaguar/Developemnt/image_demo2.png', 'rb').read()
The image is same as in given demo example(its given in .png format) and rest of code is also same.....
when I run it it gives the error as **"**
**A = fromstring(s, uint16).astype(float)**
**ValueError: string size must be a multiple of element size"**

WHat can be the error in program? I may asking stupid question Thanks in advance !
Regards
Yogesh

The example assumes that the file is a dump of uin16 512x512 array.
So, no doubt that it won't work with a png file.

See

http://matplotlib.sourceforge.net/users/image_tutorial.html

-JJ

ยทยทยท

On Tue, Mar 23, 2010 at 9:41 AM, yogesh karpate <yogeshkarpate@...287...> wrote:

The 1st code snippet of image_demo2.py is as follows

#!/usr/bin/env python
from pylab import *

w, h = 512, 512
s = file('../data/ct.raw', 'rb').read()
A = fromstring(s, uint16).astype(float)

A *= 1.0/max(A)
A.shape = w, h

I replaced s = file('../data/ct.raw', 'rb').read() with s =
file('/home/jaguar/Developemnt/image_demo2.png', 'rb').read()

The image is same as in given demo example(its given in .png format) and
rest of code is also same.....

when I run it it gives the error as "
A = fromstring(s, uint16).astype(float)
ValueError: string size must be a multiple of element size"

WHat can be the error in program? I may asking stupid question Thanks in
advance !
Regards
Yogesh

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