I have lightroom 5. I took a picture of a negative from film in raw, and I can't invert the image. When I go to the tone curve I can't grab the corners. I understand I need to pull the lower left end of the line to the upper left and vice versa on the right. It won't let me move the line up and down along the sides. Any thoughts? Thanks.
I got it to work, thank you! I appreciate the help.