brightness

Simply put, the Levels and Curves adjustments allow you to control the luminance of an image on a channel-by-channel basis. With these features, you can correct brightness, contrast, and color casts. They are essential commands and the two most powerful color correction facilities in Photoshop. The Levels command offers relative simplicity, while the Curves command gives you more control. Use one or the other as needed to adjust your images, but you'll never need both in a single project. In this article, we'll look at the features of the Levels command and then look at how the Curves command expands upon its capabilities.

This article is compiled from Chapter 14 of Deke's video course Photoshop CS5 One-on-One: Advanced. Like the last tip, it's packed with useful information, but there's even more value in viewing the actual chapter on lynda.com. Read more » 

Recently, a few of you expressed mild to moderate surprise that I resorted to Brightness/Contrast to fix an image in the Lab mode. (See this and this.) So I figured I'd run an article that I wrote about a year ago for Photoshop User magazine. Okay, so it's a repurpose, but this version appears as I submitted it, headline and all. By which I mean, with a couple of hours of updating with the denizens of deke.com in mind. Anyway, here goes:

Ask a group of Photoshop experts to name the worst function in all of Photoshop and you’ll probably get a variety of answers: Defringe (doesn’t work), Dust & Scratches (removes neither), Pattern Maker (doesn’t work), Edit > Menus (removing commands doesn't simplify the program), or my personal antifavorite, the sharpen tool (takes a perfectly good image and makes it look like it was rendered in iron filings). But I think you’ll find a fair amount of consensus around what has traditionally been the most notorious image destroyer in all of Photoshop, Brightness/Contrast.

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