I need to edit product pictures taken on white background in my photo studio so the white background is 100% white. I usually do this in Photoshop with the levels panel. I use the eyedropper inside the Ps levels panel and click in the picture on the white background. Ps changes the levels automatically so the white background becomes 100% white. This functionality I need in Affinity Photo but the levels panel has no eyedropper. Sliding the levels pointers doesn't give me a pure white background. I need a way to tell where the white pixels are that need to become pure white. Is there another workaround I can use to adapt the pictures from my photo studio so white becomes pure white? Thanks for helping me out.