This is pretty easily done with the free Windows app Paint.net.
What you want to do is open your picture in Paint.net. Then according to the screenshot below, you'll want to:
click on the menu "Adjustments" and
select "Levels". Then you remove the histogram hump at
from your picture (this hump corresponds to the gray background behind ...
You'll need to do some manual editing to get a result like that. Don't think there is anyway to do this fully automatically. I'll let you be the judge whether manual editing, then using OCR, will be quicker than simply retyping the text.
If you don't have Photoshop, get GIMP it's free.
Using the rectangle select tool, click and drag to select the entire ...