This effect/filter removes all color information for all RGB colors except for the selected one.
This effect has keyframes.
Similarity - Similarity percentage with the above color. 0.01 matches only the exact key color, while 1.0 matches everything.
Blend - Blend percentage. 0.0 makes pixels fully gray. Higher values result in more preserved color.
Color key - The color which will not be replaced with neutral gray. Use the color picker or the color button to select the color to hold.