The Gorman conversion method is a Lab L channel based method. It combines L channel conversion with masked solid layer toning and high pass filter sharpening. Because it ignores color information, this method works better on images that have little color to begin with.
Lab color mode is a mode in Photoshop. Lab is different from RGB color mode in that it separates the luminosity information into it’s own channel. Lab mode has three channels: L, a and b.
The L Channel contains the image’s luminosity information. This allows you to manipulate the image’s luminosity without affecting it’s colors. The L channel is similar to black and white film in that it only records the image’s luminosity.
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