I'm trying to make a transparent plane in blender 2.8 that works in cycles. I want to reach the same effect that I have when I set up a background image with the transparency enabled. Below you can see how I have configured the shaders :
Instead,below you can see how it should look like :
mine is too bright. I tried to change the strenght value,but I don't get the desired effect. What's wrong here ? thanks.