Assigning Intensities to Images

Hello! I want to run multiple staircases using images. Each image would have a designated intensity and I need to find a way to tell PsychoPy the intensity of each image. The layout in excel to run a staircase seems limited and doesn’t seem possible for this experiment.
The idea is that each time a participant gets an image wrong, they would move back 2 ‘level’s’ and if they got the answer correct they would advance 1 ‘level’. I’ve attached a spreadsheet trying to explain what I mean by this, but if anyone can tell me even how to assign intensities to images I would appreciate it!
Thanks in advance.
Brittany!
Screen Shot 2021-01-08 at 12.12.07 PM|690x492