Completely disable transparency on EVERYTHING?!?!

How do you completely turn off/disable Transparency in Yosemite. Its starting to drive me mad because I edit photos all day and when I view an image in preview I think something is wrong with it because I can see the background showing through the image. Also in photoshop its screwing me up cuz its transparent as well. I checked in the "Reduce Transparency" option in accessible but its still showing. This also affects when I look at images in my browser like firefox. I can't handle this anymore. Is this a bug????