I have two reference images, one for the front and one for the back. I want the images to be slightly transparent, but then I will see both images which will be confusing. How would I make it so that an image only shows up when I'm in front view, and the other only shows up when I'm in the back view?
In Blender 2.8, background is an object.
- select one of viewpoint (if you skip this step, the background is always visible regardless of viewport angle)
- type Shift-A, and select Image → Background
- select an image file
Then, you'll get an object with image. The object has settings for transparency and side, which you want.
So, add two background objects that way, and set the side to Front for one, and to Back for the other.