Difference between revisions of "HSL color"

m (included link to other languages)
(Slightly improved the code)
Line 20: Line 20:
 
elseif h < 5 then r,g,b = x,0,c
 
elseif h < 5 then r,g,b = x,0,c
 
else              r,g,b = c,0,x
 
else              r,g,b = c,0,x
end return math.ceil((r+m)*256),
+
end return (r+m)*255,(g+m)*255,(b+m)*255
          math.ceil((g+m)*256),
 
          math.ceil((b+m)*256)
 
 
end
 
end
 
</source>
 
</source>

Revision as of 04:27, 22 March 2011

The HSL color space is based on how humans perceive color, and as such, makes various aesthetically-pleasing color transformations very simple.

  • Hue describes where in the spectrum the color is. As Hue increases, a color will transition in the following order: Red, orange, yellow, green, teal, blue, violet, purple, magenta, red.
  • Saturation denotes how vibrant a color is. Ranges from grey to pure color.
  • Lightness is how light or dark a color is. Ranges from black to white. In the middle is either grey (if low saturation) or a color (if high saturation).

Here is a function Taehl wrote to convert HSL colors to RGB:

-- Converts HSL to RGB. (input and output range: 0 - 255)
function HSL(h, s, l)
	if s <= 0 then return l,l,l end
	h, s, l = h/256*6, s/255, l/255
	local c = (1-math.abs(2*l-1))*s
	local x = (1-math.abs(h%2-1))*c
	local m,r,g,b = (l-.5*c), 0,0,0
	if h < 1     then r,g,b = c,x,0
	elseif h < 2 then r,g,b = x,c,0
	elseif h < 3 then r,g,b = 0,c,x
	elseif h < 4 then r,g,b = 0,x,c
	elseif h < 5 then r,g,b = x,0,c
	else              r,g,b = c,0,x
	end return (r+m)*255,(g+m)*255,(b+m)*255
end

This could be used, for example, like this: love.graphics.setColor(HSL(150,100,200)) (this would color things a greyish blue)

Other Languages