OK so the basic problem is that we have wallpaper that is too big and need it to be a smaller size. For the following guide I will use an Olivia Lufkin background I made. The original size is 1024 x 768 but we are going to change it to an image that is 800 x 600. The first number usually refers to the width and the second number corresponds to the height. Click here to see the original image
"The first number usually refers to the width and the second number corresponds to the height."
The first thing we want to do is open the image up with Irfanview. To resize the image click on Image..Resize(Ctrl + R)