= CookBook - Validate an image size =
To check the height and width of an image uploaded via your form, you 
can implement this method into your view.py or custom manipulator.

You need PIL [http://www.pythonware.com/products/pil/]  to be installed.
== Code ==
Here we check that the image is 100*100 pixels.
{{{
import Image
import StringIO

def isValideSize(field_data, all_data):
    im = Image.open(StringIO.StringIO(field_data["content"]))
    if im.size != (100,100):
        raise validators.ValidationError, "The image size does not match 100*100"
}}}