FontString:SetVertexColor(red, green, blue [, alpha])

Sets a color shading for the region's graphics. The effect of changing this property differs by the type of region:

For FontStrings, this color overrides the normal text color (as set by FontInstance:SetTextColor()).

For Textures, this color acts as a filter applied to the texture image: each color component value is a factor by which the corresponding component values in the image are multiplied. (See examples.)


Signature:

Arguments:

• red - Red component of the color (0.0 - 1.0) (number)
  
• green - Green component of the color (0.0 - 1.0) (number)
  
• blue - Blue component of the color (0.0 - 1.0) (number)
  
• alpha - Alpha (opacity) for the graphic (0.0 = fully transparent, 1.0 = fully opaque) (number)

Examples:
-- first, target an elite creature or NPC so the "gold dragon" target border appears
-- then try running the following scripts:

TargetFrameTexture:SetVertexColor(1,0,0)
-- omits the green and blue channels from the image, giving it a red tint

TargetFrameTexture:SetVertexColor(0,0,1)
-- omits the red and green channels from the image: note the image is mostly black,
-- as the gold color of the dragon image comes primarily from red and green channels

TargetFrameTexture:SetVertexColor(0,0,0)
-- omits all color channels, leaving a black shadow defined by the image's alpha channel

TargetFrameTexture:SetVertexColor(1,1,1)
-- removes vertex shading, returning the image to its original colors