The hex color #638c4c is a dark color. The web-safe version is Hex
#669933. A complementary color is
#9C73B3. The grayscale version is
#696969. A 20% lighter version of the original color is
#96BF7F, and Hex
#305919 is the 20% darker color. If the color is saturated by 10%, you get
#629049. If the color is desaturated by 10%, the color
#64894F is obtained.