The hex color #639c4c is a light color. The web-safe version is Hex
#669933. A complementary color is
#9C63B3. The grayscale version is
#6E6E6E. A 20% lighter version of the original color is
#96CF7F, and Hex
#306919 is the 20% darker color. If the color is saturated by 10%, you get
#62A149. If the color is desaturated by 10%, the color
#64974F is obtained.