How to obtain image size using standard Python class (without using external library)?

Question

I am using Python 2.5. And using the standard classes from Python, I want to determine the image size of a file.

I\'ve heard PIL (Python Image Library), but it requi

Answer 1

While it's possible to call open(filename, 'rb') and check through the binary image headers for the dimensions, it seems much more useful to install PIL and spend your time writing great new software! You gain greater file format support and the reliability that comes from widespread usage. From the PIL documentation, it appears that the code you would need to complete your task would be:

from PIL import Image
im = Image.open('filename.png')
print 'width: %d - height: %d' % im.size # returns (width, height) tuple

As for writing code yourself, I'm not aware of a module in the Python standard library that will do what you want. You'll have to open() the image in binary mode and start decoding it yourself. You can read about the formats at:

• PNG file format documentation
• Notes on the JPEG file format headers