Converting HTML with form to whole image

I have a question... I am aware that if you print a web page containing tables with background colors, the background colors won't be printed unless the user sets it. Now I have an idea, why don't I take the webpage, find a way to somehow convert it to an image (jpg, gif, png, or any image format) then print the image instead. That way, whatever the option the user sets it still prints as colored on the paper. If you're wondering why I want to force the users to print it colored, it's because the users will be around their 70s or 60s and those who merely or just used the computer. I wouldn't want to bother them with settings and stuff. What they want is straight-forward print. They'll be filling up a form then that form will get printed and they'd be able to fax it to a receiving office.

Thank you in advance for your help.

Tidbit: This is actually my first post here on TWF... I see that I can gain a lot of knowledge here and I look forward to getting help on my other web problems...