Color to Greyscale Image Filter Tool - Settings Tab

Operation Description
Luminance (default) Outputs an image of the luminance. Luminance is closely related to intensity in concept, and is a measure of the amount of light emitted or reflected from a particular area; the more light emitted from a pixel in the input image, the lighter its appearance in the output image.
Red Outputs an image that filters out all but the Red (255,0,0) component of the pixel. The higher a pixel's Red value in the input image, the lighter its appearance in the output image.
Green Outputs an image that filters out all but the Green (0,255,0) component of the pixel. The higher a pixel's Green value in the input image, the lighter its appearance in the output image.
Blue Outputs an image that filters out all but the Blue (0,0,255) component of the pixel. The higher a pixel's Blue value in the input image, the lighter its appearance in the output image.
Hue Outputs an image that filters out all but the Hue component of the pixel. The higher a pixel's Hue value in the input image, the lighter its appearance in the output image.
Saturation Outputs an image that filters out all but the Saturation component of the pixel. The higher a pixel's Saturation value in the input image, the lighter its appearance in the output image.
Intensity Outputs an image that filters out all but the Intensity component of the pixel, and to determine the average intensity of the pixel's RGB components. The higher a pixel's Intensity value in the input image, the lighter its appearance in the output image.
Interpolation Outputs an image filter that uses Interpolation, a weighted average of the Red, Green and Blue (RGB) components of a pixel. As with the Intensity Operation, the result is to filter out all but the Intensity component of the pixel The higher a pixel's Intensity value in the input image, the lighter its appearance in the output image. However, Interpolation determines the weighted average Intensity of the RGB components, and is a non-standard conversion filter.