Tag Archives: How-to

Lab Color Mode

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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Grayscale Mode

Grayscale mode is a color mode in Photoshop. In grayscale mode, images are represented using only shades of gray rather than the full pallet of colors.

In RGB mode, the color of each pixel is stored as three numbers, or channels (nnn, nnn, nnn). If all three channels have the same value then the resulting color is a shade of gray.

Black (0,0,0)
Gray (80, 80, 80)
Gray (160, 160, 160)
White (255, 255, 255)

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Selective Color

Hand-coloring has been used by photographers for over a century to add color to black and white photographs. This was done by hand painting the photograph with oil or watercolor paints. Unlike toning, which applies the same color to the entire image, selective coloring applies one or more colors to specific parts of the image.

The usual way to apply selective color is to use a mask and a solid color layer to apply color to specific parts of the image. However, by using Color Range selection and curves, you can create a more subtle look.

Selective Color

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