How to get access to image data through browser object in powershell?

I'm trying to automate website testing using powershell. I need to compare one of the images in tag with a file on my hard drive.

Is there a way to access the file without dow开发者_运维知识库nloading the file the second time?

.. if it's not..

Is there a way to force the browser object (ie9) to get the site without images (without changing it in the settings of the browser) and then download the images individually?