Module:Color contrast: Difference between revisions
m>Izkala (v1 should be the brighter of the two) |
m>Mr. Stradivarius m (whitespace fixes) |
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Line 13: | Line 13: | ||
else | else | ||
v = math.pow((v+0.055)/1.055, 2.4) | v = math.pow((v+0.055)/1.055, 2.4) | ||
end | |||
return v | return v | ||
end | end | ||
local function color2lum( c ) | local function color2lum( c ) | ||
if (c == nil) then | if (c == nil) then | ||
return '' | return '' | ||
end | end | ||
local HTMLcolor = { | local HTMLcolor = { | ||
white = 1, | white = 1, | ||
silver = 0.52711512570581, | silver = 0.52711512570581, | ||
gray = 0.2158605001139, | gray = 0.2158605001139, | ||
black = 0, | black = 0, | ||
red = 0.2126, | red = 0.2126, | ||
maroon = 0.045891942324215, | maroon = 0.045891942324215, | ||
yellow = 0.9278, | yellow = 0.9278, | ||
olive = 0.20027537200568, | olive = 0.20027537200568, | ||
lime = 0.7152, | lime = 0.7152, | ||
green = 0.15438342968146, | green = 0.15438342968146, | ||
aqua = 0.7874, | aqua = 0.7874, | ||
teal = 0.16996855778968, | teal = 0.16996855778968, | ||
blue = 0.0722, | blue = 0.0722, | ||
navy = 0.015585128108224, | navy = 0.015585128108224, | ||
fuchsia = 0.2848, | fuchsia = 0.2848, | ||
purple = 0.061477070432439, | purple = 0.061477070432439, | ||
orange = 0.4817026703631, | orange = 0.4817026703631, | ||
gold = 0.69860877428159, | |||
pink = 0.63271070702466, | |||
lightpink = 0.58566152734898, | |||
hotpink = 0.34658438169715, | |||
deeppink = 0.23866895828276, | |||
palevioletred = 0.28754994117889, | |||
mediumvioletred = 0.14371899849357, | |||
lightsalmon = 0.4780675225206, | |||
salmon = 0.36977241527596, | |||
darksalmon = 0.40541471563381, | |||
lightcoral = 0.35522120733135, | |||
indianred = 0.21406134963884, | |||
crimson = 0.16042199953026, | |||
firebrick = 0.10724525535015, | |||
darkred = 0.054889674531132, | |||
orangered = 0.25516243753416, | |||
tomato = 0.30638612719415, | |||
coral = 0.37017930872924, | |||
darkorange = 0.40016167026524, | |||
lightyellow = 0.98161818392882, | |||
lemonchiffon = 0.94038992245622, | |||
lightgoldenrodyellow = 0.93348351018297, | |||
papayawhip = 0.87797100199835, | |||
moccasin = 0.80083000991567, | |||
peachpuff = 0.74905589878251, | |||
palegoldenrod = 0.78792647887614, | |||
khaki = 0.77012343394121, | |||
darkkhaki = 0.45747326349994, | |||
cornsilk = 0.93562110372965, | |||
blanchedalmond = 0.85084439608156, | |||
bisque = 0.80732327372979, | |||
navajowhite = 0.76519682342785, | |||
wheat = 0.74909702820482, | |||
burlywood = 0.51559844533893, | |||
tan = 0.48237604163921, | |||
rosybrown = 0.32319457649407, | |||
sandybrown = 0.46628543696283, | |||
goldenrod = 0.41919977809569, | |||
darkgoldenrod = 0.27264703559993, | |||
peru = 0.30113074877936, | |||
chocolate = 0.23898526114557, | |||
saddlebrown = 0.097922285020521, | |||
sienna = 0.13697631337098, | |||
brown = 0.098224287876511, | |||
} | |||
-- whitespace | |||
c = c:match( '^%s*(.-)%s*$' ) | |||
-- lowercase | -- lowercase | ||
c = c:lower() | c = c:lower() | ||
-- first try to look it up | -- first try to look it up | ||
local L = HTMLcolor[c] | local L = HTMLcolor[c] | ||
Line 104: | Line 104: | ||
local cs = mw.text.split(c or '', '') | local cs = mw.text.split(c or '', '') | ||
if( #cs == 6 ) then | if( #cs == 6 ) then | ||
local R = sRGB( (16*tonumber('0x' .. cs[1]) + tonumber('0x' .. cs[2]))/255 ) | |||
local G = sRGB( (16*tonumber('0x' .. cs[3]) + tonumber('0x' .. cs[4]))/255 ) | local G = sRGB( (16*tonumber('0x' .. cs[3]) + tonumber('0x' .. cs[4]))/255 ) | ||
local B = sRGB( (16*tonumber('0x' .. cs[5]) + tonumber('0x' .. cs[6]))/255 ) | local B = sRGB( (16*tonumber('0x' .. cs[5]) + tonumber('0x' .. cs[6]))/255 ) | ||
L = 0.2126 * R + 0.7152 * G + 0.0722 * B | L = 0.2126 * R + 0.7152 * G + 0.0722 * B | ||
return L | return L | ||
elseif ( #cs == 3 ) then | elseif ( #cs == 3 ) then | ||
local R = sRGB( (16*tonumber('0x' .. cs[1]) + tonumber('0x' .. cs[1]))/255 ) | |||
local G = sRGB( (16*tonumber('0x' .. cs[2]) + tonumber('0x' .. cs[2]))/255 ) | local G = sRGB( (16*tonumber('0x' .. cs[2]) + tonumber('0x' .. cs[2]))/255 ) | ||
local B = sRGB( (16*tonumber('0x' .. cs[3]) + tonumber('0x' .. cs[3]))/255 ) | local B = sRGB( (16*tonumber('0x' .. cs[3]) + tonumber('0x' .. cs[3]))/255 ) | ||
L = 0.2126 * R + 0.7152 * G + 0.0722 * B | L = 0.2126 * R + 0.7152 * G + 0.0722 * B | ||
return L | return L | ||
end | end | ||
-- failure, return blank | -- failure, return blank | ||
return '' | return '' |
Revision as of 18:14, 25 July 2015
Documentation for this module may be created at Module:Color contrast/doc
-- -- This module implements -- {{Color contrast ratio}} -- {{Greater color contrast ratio}} -- {{ColorToLum}} -- {{RGBColorToLum}} -- local p = {} local function sRGB ( v ) if (v <= 0.03928) then v = v / 12.92 else v = math.pow((v+0.055)/1.055, 2.4) end return v end local function color2lum( c ) if (c == nil) then return '' end local HTMLcolor = { white = 1, silver = 0.52711512570581, gray = 0.2158605001139, black = 0, red = 0.2126, maroon = 0.045891942324215, yellow = 0.9278, olive = 0.20027537200568, lime = 0.7152, green = 0.15438342968146, aqua = 0.7874, teal = 0.16996855778968, blue = 0.0722, navy = 0.015585128108224, fuchsia = 0.2848, purple = 0.061477070432439, orange = 0.4817026703631, gold = 0.69860877428159, pink = 0.63271070702466, lightpink = 0.58566152734898, hotpink = 0.34658438169715, deeppink = 0.23866895828276, palevioletred = 0.28754994117889, mediumvioletred = 0.14371899849357, lightsalmon = 0.4780675225206, salmon = 0.36977241527596, darksalmon = 0.40541471563381, lightcoral = 0.35522120733135, indianred = 0.21406134963884, crimson = 0.16042199953026, firebrick = 0.10724525535015, darkred = 0.054889674531132, orangered = 0.25516243753416, tomato = 0.30638612719415, coral = 0.37017930872924, darkorange = 0.40016167026524, lightyellow = 0.98161818392882, lemonchiffon = 0.94038992245622, lightgoldenrodyellow = 0.93348351018297, papayawhip = 0.87797100199835, moccasin = 0.80083000991567, peachpuff = 0.74905589878251, palegoldenrod = 0.78792647887614, khaki = 0.77012343394121, darkkhaki = 0.45747326349994, cornsilk = 0.93562110372965, blanchedalmond = 0.85084439608156, bisque = 0.80732327372979, navajowhite = 0.76519682342785, wheat = 0.74909702820482, burlywood = 0.51559844533893, tan = 0.48237604163921, rosybrown = 0.32319457649407, sandybrown = 0.46628543696283, goldenrod = 0.41919977809569, darkgoldenrod = 0.27264703559993, peru = 0.30113074877936, chocolate = 0.23898526114557, saddlebrown = 0.097922285020521, sienna = 0.13697631337098, brown = 0.098224287876511, } -- whitespace c = c:match( '^%s*(.-)%s*$' ) -- lowercase c = c:lower() -- first try to look it up local L = HTMLcolor[c] if (L ~= nil) then return L end -- remove leading # (if there is one) and whitespace c = mw.ustring.match(c, '^[%s#]*([a-f0-9]*)[%s]*$') -- split into rgb local cs = mw.text.split(c or '', '') if( #cs == 6 ) then local R = sRGB( (16*tonumber('0x' .. cs[1]) + tonumber('0x' .. cs[2]))/255 ) local G = sRGB( (16*tonumber('0x' .. cs[3]) + tonumber('0x' .. cs[4]))/255 ) local B = sRGB( (16*tonumber('0x' .. cs[5]) + tonumber('0x' .. cs[6]))/255 ) L = 0.2126 * R + 0.7152 * G + 0.0722 * B return L elseif ( #cs == 3 ) then local R = sRGB( (16*tonumber('0x' .. cs[1]) + tonumber('0x' .. cs[1]))/255 ) local G = sRGB( (16*tonumber('0x' .. cs[2]) + tonumber('0x' .. cs[2]))/255 ) local B = sRGB( (16*tonumber('0x' .. cs[3]) + tonumber('0x' .. cs[3]))/255 ) L = 0.2126 * R + 0.7152 * G + 0.0722 * B return L end -- failure, return blank return '' end function p._greatercontrast(args) local bias = tonumber(args['bias'] or '0') or 0 local v1 = color2lum(args[1] or '') local c2 = args[2] or '#FFFFFF' local v2 = color2lum(c2) local c3 = args[3] or '#000000' local v3 = color2lum(c3) local ratio1 = 0; local ratio2 = 0; if (type(v1) == 'number' and type(v2) == 'number') then ratio1 = (v2 + 0.05)/(v1 + 0.05) ratio1 = (ratio1 < 1) and 1/ratio1 or ratio1 end if (type(v1) == 'number' and type(v3) == 'number') then ratio2 = (v3 + 0.05)/(v1 + 0.05) ratio2 = (ratio2 < 1) and 1/ratio2 or ratio2 end return (ratio1 + bias > ratio2) and c2 or c3 end function p._ratio(args) local v1 = color2lum(args[1]) local v2 = color2lum(args[2]) if (type(v1) == 'number' and type(v2) == 'number') then -- v1 should be the brighter of the two. if v2 > v1 then v1, v2 = v2, v1 end return (v1 + 0.05)/(v2 + 0.05) else return args['error'] or '?' end end function p.lum(frame) return color2lum(frame.args[1] or frame:getParent().args[1]) end function p.ratio(frame) local args = frame.args[1] and frame.args or frame:getParent().args return p._ratio(args) end function p.greatercontrast(frame) local args = frame.args[1] and frame.args or frame:getParent().args return p._greatercontrast(args) end return p