You're right... it's a great piece of advice... however, I don't know if it would work on this documenmt in particular, but for others.. it is definetly a good idea. Just a quick question, I'm not quite a pro... how would I protect the colored elements from the background by using a mask when adjusting the levels? If I were to select them and then mask it, it would remvoe the background. So then I would just edit the levels on the other layer and keep the mask as it is? Something like this?
Open the picture file. This will be the Background Layer.
Open a Levels Adjustment layer above the Background Layer
Use the sliders below the histogram to adjust levels until the picture's background is satisfactory for your purpose. The entire picture is now altered.
Set your foreground color chip to black and activate the Brush tool
With the black brush, paint over the object to "mask" the levels effect. If you go too far, correct with a white brush. Black hides, white reveals.
TIPS: You can change the size of the brush cursor with the bracket keys next to the letter P on the keyboard
Press on x key to toggle between black/white color chips.