I've rarely found tutorials that involve darkening too bright images (and no, I am not asking for links to tutorials, mods).
What I'm asking for is techniques/explanations/recommendations on steps to help darken images that are too bright for some tutorials. I would like to learn how to do this. Do you use a Levels layer? A Curves layer? I don't need explanations on how to use Levels/Curves, but my problem is, I usually use those Adjustment layers to brighten the image, and it's hard (for me, personally) to take that knowledge and flip it to make an image darker. Not all images are the same, too.
I've been making icons for six years, but I'm still learning every time I put out a batch. I hate skipping images because I can't find a way to make them dark enough to look good using my coloring effects. I'd appreciate any advice/explanations you can offer on how to make images darker.
I use Photoshop CS2, by the way.