So I have a background image that I have repeating, it is just a blue box, there is nothing else. I'm doing this just to test to see what it looks like but when I place the code in, it gives me a lighter blue border around the image. When I edit the image in photoshop and I use the eyedropper tool there is no lighter color. Any thoughts?
You can clearly see the light
You can clearly see the light edges when you look at the image on its own:
Here is the image expanded to 500%:
My guess is that you compressed it too harshly. Don't use a JPG if you are concerned about color accuracy or the presence of compression artifacts.