By applying a curve to the A and B channels, you can heighten color separation across the image and make colors appear crisper and more defined. The key is understanding how to use this technique effectively.
- [Instructor] You can apply a curve adjustment … to the color channels in Lab … with powerful results. … In fact, even if I don't intend … to radically alter the color structure of an image, … I often steepen the color channel curves, … simply to add great color contrast and vibrancy in an image. … To apply a curve adjustment to the color channels in Lab, … first convert the image to the Lab color space … using Image, Mode, Lab Color. … Next, open the Curves dialog box, … Image, Adjustment, Curves. … Each color channel can be selected … using the channel dropdown list. … So you can see there's an A channel, … a B channel, and the Lightness channel up at the top. … So you could, in fact, … alter an image like this oriental lily here … by altering all three channels in one fell swoop … of the curves dialog. … However I don't recommend this. … As a matter of workflow, it's better to modify each channel … as a separate adjustment, … clicking OK when you're satisfied with each adjustment …
- Converting images to Lab Color space
- Applying Curves to Lab channels
- Selective sharpening
- Inverting channels
- Making per-channel equalizations
- Using the Lab action
- Combining Lab Color with blending modes
- Making patterns with Lab images
Skill Level Advanced
Photoshop: Backgrounds and Textureswith Harold Davis2h 18m Intermediate
Enhancing Landscape Photos with Photoshop and Lightroomwith Ben Long1h 30m Intermediate
Enhancing Night and Low-Light Photos with Photoshopwith Seán Duggan2h 12m Intermediate
1. Fine-Tuning an Image with LAB and Curves
2. Using the Inversion Adjustment
Inverting the A channel3m 25s
3. Working with Equalizations
4. A Palette of Lab Possibilities
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