Difference between revisions of "HSV color"
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*'''Value''' is how saturated an image is, the amount of each color. | *'''Value''' is how saturated an image is, the amount of each color. | ||
− | This function converts HSV values to RGB | + | This function converts HSV values to RGB, note that |
<source lang="lua"> | <source lang="lua"> | ||
-- Converts HSV to RGB. (input and output range: 0 - 255) | -- Converts HSV to RGB. (input and output range: 0 - 255) | ||
+ | |||
function HSV(h, s, v) | function HSV(h, s, v) | ||
if s <= 0 then return v,v,v end | if s <= 0 then return v,v,v end |
Revision as of 11:07, 1 October 2011
The HSV 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.
- Value is how saturated an image is, the amount of each color.
This function converts HSV values to RGB, note that
-- Converts HSV to RGB. (input and output range: 0 - 255)
function HSV(h, s, v)
if s <= 0 then return v,v,v end
h, s, v = h/256*6, s/255, v/255
local c = v*s
local x = (1-math.abs((h%2)-1))*c
local m,r,g,b = (v-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
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