An L-channel inversion of an image on white often leads to an image on black where the key subject matter is too dark. This can be fixed by selectively applying a curves adjustment.
- [Instructor] What happens when good L channel … inversions go bad? … Well, not really bad. … But suppose you invert the L channel … and not only does a white background go black … but so do the flowers on the white background … or the other things you have on the white background. … This is a pretty common scenario … and there are several good ways to resolve the problem. … That will help those bad L channel inversions … straighten up and fly right. … Check out this light box composition … consisting of a central row of two anemones, … a central tulip, and framed by two rows … of Queen Anne's lace. … As you've seen earlier in this chapter, … it's easy to invert a light box image on white … to a black background. … But I foresee trouble here. … So I'd like to set this image up for success. … My strategy is to first invert the image … and put it on a black background … and then to apply successive curves … to the lightness channel to adjust the contrast … so the flowers have not been darkened unattractively …
- 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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