Cool color correction through "Levels"

So I just figured this out yesterday, say you have something you colored in with markers, or in my case, I painted something with watercolor.  I don't have an example, so I can just walk through the process.  Its using levels, but I didn't have to keep sliding the shadow, midtone, & highlights arrow back & forth until I found something that was sort of what I wanted.  It usually would blow out my hot colors like red & yellow and make my dark pencil lines over bearing.  This hit it every time.   

1. So you just scanned your image, the colors look like shit, because scanners aren't a magical piece of machinery like in the movies and don't scan exactly what is in front of you.

2. Either go to Image > Adjustements > Levels or hotkey: Apple + L (Mac), or Ctrl +L (PC)

 This should be what comes up, make sure preview is selected.

3.  Open "Options..."

 This is what you should see next.

4. Under Algorithms, click the 3rd option, "Find Dark & Light Colors", then hit ok.

If you have preview selected, it should show you right away.  I used it for all of my scans yesterday with my paintings and it was perfect everytime.  I have no idea what the other options on this window do, but I'm assuming if you have a one color image the 1st option would work well...play around.  I'm going to need this when I scan Mini Battle Men #2 this week.