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Luminosity Based Conversion Methods
There are five Luminosity Based conversion methods:
- Straight Grayscale Conversion is simple to use. It is used mostly for removing unwanted channels.
- Gradient Map Conversion is a fast, simple method that gives good results.
- Straight Desaturation Conversion is not very effective by itself. It is used mostly in conjunction with other methods.
- Lab Lightness Channel Conversion takes advantage of the Lab color mode's lightness channel.
- The Gorman-Holbert Method is a very complex conversion method. It combines the use of Lab Lightness and Solid Color Layer Toning.
Luminosity based black and white conversion methods convert images to grayscale based only on the color's brightness or luminosity. This is similar to the way black and white film captures only the scene's brightness. These methods are very restrictive in how they convert colors to black and white. They convert images to grayscale the same way, every time, with no input from the user.
Luminosity methods work best on images that have plenty of contrast, or images with little or no color to begin with. For example, this photograph has plenty of contrast and almost no color.
Here's the same image converted using Gorman.
