The Canyon Conundrum and Other Adventures in the Most Powerful Colorspace
This is an extensive overview of the use of the LAB colorspace for colour corrections in Photoshop.
Photoshop LAB Color : The Canyon Conundrum and Other Adventures in the Most Powerful Colorspace
Peachpit Press (August 8, 2005)
Table of contents
- The Canyon Conundrum
The basic LAB enhancement technique is very powerful—but it always seems to be used on a single category of image.
- LAB by the Numbers
A general description of how LAB is set up, complete with opponentcolor channels, imaginary colors, and positive and negative numbers.
- Vary the Recipe, Vary the Color
Choosing different angles for the AB curves—and making sure that Photoshop is properly configured.
- It’s All About The Center Point
How LAB defines neutrality—a zero is a gray—is the key to its color-enhancement potential
- Sharpen the L, Blur the AB
Separate channels for color and contrast give LAB a decisive advantage in blurring. Often it’s the best sharpening space as well.
- Entering the Forest: Myths and Dangers
Understanding LAB requires discarding bogus preconceptions—and being aware of real risks.
- Summing Up: LAB and the Workflow
How LAB fits into your workflow depends on both your expertise and how much time you have per image.
- The Imaginary Color, The Impossible Retouch
What happens when LAB calls for a color that isn’t just out of gamut, but that couldn’t possibly exist?
- The LAB Advantage in Selections and Masking
With the A and B channels, we can create masks that seem to come out of thin air—or selections of thin air.
- The Product Is Red but The Client Wants Green
The most convincing way to make radical color changes—or to match a PMS specification.
- The Best Retouching Space
In complicated collaging, moiré elimination, adding color to selected areas, restoring older images, and painting, LAB has big advantages.
- Command, Click, Control
Advanced LAB curves can drive objects away from one another without ever selecting them. It only requires a click of the mouse.
- The Universal Interchange Standard
How LAB is (and how it should be) used to facilitate colorspace transfers, and to match PMS colors.
- Once for Color, Once for Contrast
Some LAB techniques can translate into RGB—provided you separate color and contrast in your mind.
- Blending With the A and B
Smashing channels that contain no detail into the L, which does, seems crazy—but it’s extraordinarily effective at creating transitions.
- A Face Is Like a Canyon
Introducing a powerful RGB-LAB hybrid, a recipe that dramatically improves the appearance and believability of almost all portraits.