Extract Channel

This command lets you extract one channel of a color image as a black and white image or one channel of a 48-bit color image as a 16-bit black and white image.

Channel

This control lets you select the channel you want to extract.

Luminance -- extracts the luminance of the color image. Luminance is an average of the red, green and blue channels weighted according to the sensitivity of the eye to different colors. It is a good representation of the perceived brightness of the image.

Red -- extracts the red channel

Green -- extracts the green channel

Blue -- extracts the blue channel

HSV-H -- converts the image to the HSV color space and extracts the hue channel

HSV-S -- converts the image to the HSV color space and extracts the saturation channel

HSV-V -- converts the image to the HSV color space and extracts the value channel

HSL-H -- converts the image to the HSL color space and extracts the hue channel

HSL-S -- converts the image to the HSL color space and extracts the saturation channel

HSL-L -- converts the image to the HSL color space and extracts the lightness channel

Tips

A channel you extract can be used as a mask for the input image. For example, this lets you create a mask based on saturation or hue.

You can generate interesting effects by extracting the three color components of an image, modifying them, and then recombining the modified channels using the Combine Channels transformation.