IMAGE LEVELS; brightening up a background

On this take, I had to use my previous image, so I decided to use the fish again as it was a bright and colourful image in the first place. We had to go to window and make sure channels was ticked and a menu should come up on your right. Then we had to change the mode to CYMK colour and then we could play with the different colours in the new menu to see what effects we got, we could also use the sliders in image-brightness and contrast to see what colours we could get.