colorspace.m

function varargout = colorspace(Conversion,varargin)
%COLORSPACE  Convert a color image between color representations.
%   B = COLORSPACE(S,A) converts the color representation of image A
%   where S is a string specifying the conversion.  S tells the
%   source and destination color spaces, S = 'dest<-src', or
%   alternatively, S = 'src->dest'.  Supported color spaces are
%
%     'RGB'              R'G'B' Red Green Blue (ITU-R BT.709 gamma-corrected)
%     'YPbPr'            Luma (ITU-R BT.601) + Chroma 
%     'YCbCr'/'YCC'      Luma + Chroma ("digitized" version of Y'PbPr)
%     'YUV'              NTSC PAL Y'UV Luma + Chroma
%     'YIQ'              NTSC Y'IQ Luma + Chroma
%     'YDbDr'            SECAM Y'DbDr Luma + Chroma
%     'JPEGYCbCr'        JPEG-Y'CbCr Luma + Chroma
%     'HSV'/'HSB'        Hue Saturation Value/Brightness
%     'HSL'/'HLS'/'HSI'  Hue Saturation Luminance/Intensity
%     'XYZ'              CIE XYZ
%     'Lab'              CIE L*a*b* (CIELAB)
%     'Luv'              CIE L*u*v* (CIELUV)
%     'Lch'              CIE L*ch (CIELCH)
%
%  All conversions assume 2 degree observer and D65 illuminant.  Color
%  space names are case insensitive.  When R'G'B' is the source or
%  destination, it can be omitted. For example 'yuv<-' is short for
%  'yuv<-rgb'.
%
%  MATLAB uses two standard data formats for R'G'B': double data with
%  intensities in the range 0 to 1, and uint8 data with integer-valued
%  intensities from 0 to 255.  As MATLAB's native datatype, double data is
%  the natural choice, and the R'G'B' format used by colorspace.  However,
%  for memory and computational performance, some functions also operate
%  with uint8 R'G'B'.  Given uint8 R'G'B' color data, colorspace will
%  first cast it to double R'G'B' before processing.
%
%  If A is an Mx3 array, like a colormap, B will also have size Mx3.
%
%  [B1,B2,B3] = COLORSPACE(S,A) specifies separate output channels.
%  COLORSPACE(S,A1,A2,A3) specifies separate input channels.
% Pascal Getreuer 2005-2006
%%% Input parsing %%%
if nargin < 2, error('Not enough input arguments.'); end
[SrcSpace,DestSpace] = parse(Conversion);
if nargin == 2
   Image = varargin{1};
elseif nargin >= 3
   Image = cat(3,varargin{:});
else
   error('Invalid number of input arguments.');
end
FlipDims = (size(Image,3) == 1);
if FlipDims, Image = permute(Image,[1,3,2]); end
if ~isa(Image,'double'), Image = double(Image)/255; end
if size(Image,3) ~= 3, error('Invalid input size.'); end
SrcT = gettransform(SrcSpace);
DestT = gettransform(DestSpace);
if ~ischar(SrcT) & ~ischar(DestT)
   % Both source and destination transforms are affine, so they
   % can be composed into one affine operation
   T = [DestT(:,1:3)*SrcT(:,1:3),DestT(:,1:3)*SrcT(:,4)+DestT(:,4)];      
   Temp = zeros(size(Image));
   Temp(:,:,1) = T(1)*Image(:,:,1) + T(4)*Image(:,:,2) + T(7)*Image(:,:,3) + T(10);
   Temp(:,:,2) = T(2)*Image(:,:,1) + T(5)*Image(:,:,2) + T(8)*Image(:,:,3) + T(11);
   Temp(:,:,3) = T(3)*Image(:,:,1) + T(6)*Image(:,:,2) + T(9)*Image(:,:,3) + T(12);
   Image = Temp;
elseif ~ischar(DestT)
   Image = rgb(Image,SrcSpace);
   Temp = zeros(size(Image));
   Temp(:,:,1) = DestT(1)*Image(:,:,1) + DestT(4)*Image(:,:,2) + DestT(7)*Image(:,:,3) + DestT(10);
   Temp(:,:,2) = DestT(2)*Image(:,:,1) + DestT(5)*Image(:,:,2) + DestT(8)*Image(:,:,3) + DestT(11);
   Temp(:,:,3) = DestT(3)*Image(:,:,1) + DestT(6)*Image(:,:,2) + DestT(9)*Image(:,:,3) + DestT(12);
   Image = Temp;
else
   Image = feval(DestT,Image,SrcSpace);
end
%%% Output format %%%
if nargout > 1
   varargout = {Image(:,:,1),Image(:,:,2),Image(:,:,3)};
else
   if FlipDims, Image = permute(Image,[1,3,2]); end
   varargout = {Image};
end
return;

function [SrcSpace,DestSpace] = parse(Str)
% Parse conversion argument
if isstr(Str)
   Str = lower(strrep(strrep(Str,'-',''),' ',''));
   k = find(Str == '>');
   
   if length(k) == 1         % Interpret the form 'src->dest'
      SrcSpace = Str(1:k-1);
      DestSpace = Str(k+1:end);
   else
      k = find(Str == '<');
      
      if length(k) == 1      % Interpret the form 'dest<-src'
         DestSpace = Str(1:k-1);
         SrcSpace = Str(k+1:end);
      else
         error(['Invalid conversion, ''',Str,'''.']);
      end   
   end
   
   SrcSpace = alias(SrcSpace);
   DestSpace = alias(DestSpace);
else
   SrcSpace = 1;             % No source pre-transform
   DestSpace = Conversion;
   if any(size(Conversion) ~= 3), error('Transformation matrix must be 3x3.'); end
end
return;

function Space = alias(Space)
Space = strrep(Space,'cie','');
if isempty(Space)
   Space = 'rgb';
end
switch Space
case {'ycbcr','ycc'}
   Space = 'ycbcr';
case {'hsv','hsb'}
   Space = 'hsv';
case {'hsl','hsi','hls'}
   Space = 'hsl';
case {'rgb','yuv','yiq','ydbdr','ycbcr','jpegycbcr','xyz','lab','luv','lch'}
   return;
end
return;

function T = gettransform(Space)
% Get a colorspace transform: either a matrix describing an affine transform,
% or a string referring to a conversion subroutine
switch Space
case 'ypbpr'
   T = [0.299,0.587,0.114,0;-0.1687367,-0.331264,0.5,0;0.5,-0.418688,-0.081312,0];
case 'yuv'
   % R'G'B' to NTSC/PAL YUV
   T = [0.299,0.587,0.114,0;-0.147,-0.289,0.436,0;0.615,-0.515,-0.100,0];
case 'ydbdr'
   % R'G'B' to SECAM YDbDr
   T = [0.299,0.587,0.114,0;-0.450,-0.883,1.333,0;-1.333,1.116,0.217,0];
case 'yiq'
   % R'G'B' in [0,1] to NTSC YIQ in [0,1];[-0.595716,0.595716];[-0.522591,0.522591];
   T = [0.299,0.587,0.114,0;0.595716,-0.274453,-0.321263,0;0.211456,-0.522591,0.311135,0];
case 'ycbcr'
   % R'G'B' (range [0,1]) to ITU-R BRT.601 (CCIR 601) Y'CbCr
   % Poynton, Equation 3, scaling of R'G'B to Y'PbPr conversion
   T = [65.481,128.553,24.966,16;-37.797,-74.203,112.0,128;112.0,-93.786,-18.214,128];
case 'jpegycbcr'
   T = [0.299,0.587,0.114,0;-0.168736,-0.331264,0.5,0.5;0.5,-0.418688,-0.081312,0.5]*255;
case {'rgb','xyz','hsv','hsl','lab','luv','lch'}
   T = Space;
otherwise
   error(['Unknown color space, ''',Space,'''.']);
end
return;

function Image = rgb(Image,SrcSpace)
% Convert to Rec. 709 R'G'B' from 'SrcSpace'
switch SrcSpace
case 'rgb'
   return;
case 'hsv'
   % Convert HSV to R'G'B'
   Image = huetorgb((1 - Image(:,:,2)).*Image(:,:,3),Image(:,:,3),Image(:,:,1));
case 'hsl'
   % Convert HSL to R'G'B'
   L = Image(:,:,3);
   Delta = Image(:,:,2).*min(L,1-L);
   Image = huetorgb(L-Delta,L+Delta,Image(:,:,1));
case {'xyz','lab','luv','lch'}
   % Convert to CIE XYZ
   Image = xyz(Image,SrcSpace);
   % Convert XYZ to RGB
   T = [3.240479,-1.53715,-0.498535;-0.969256,1.875992,0.041556;0.055648,-0.204043,1.057311];
   R = T(1)*Image(:,:,1) + T(4)*Image(:,:,2) + T(7)*Image(:,:,3);  % R
   G = T(2)*Image(:,:,1) + T(5)*Image(:,:,2) + T(8)*Image(:,:,3);  % G
   B = T(3)*Image(:,:,1) + T(6)*Image(:,:,2) + T(9)*Image(:,:,3);  % B
   % Desaturate and rescale to constrain resulting RGB values to [0,1]   
   AddWhite = -min(min(min(R,G),B),0);
   Scale = max(max(max(R,G),B)+AddWhite,1);
   R = (R + AddWhite)./Scale;
   G = (G + AddWhite)./Scale;
   B = (B + AddWhite)./Scale;   
   % Apply gamma correction to convert RGB to Rec. 709 R'G'B'
   Image(:,:,1) = gammacorrection(R);  % R'
   Image(:,:,2) = gammacorrection(G);  % G'
   Image(:,:,3) = gammacorrection(B);  % B'
otherwise  % Conversion is through an affine transform
   T = gettransform(SrcSpace);
   temp = inv(T(:,1:3));
   T = [temp,-temp*T(:,4)];
   R = T(1)*Image(:,:,1) + T(4)*Image(:,:,2) + T(7)*Image(:,:,3) + T(10);
   G = T(2)*Image(:,:,1) + T(5)*Image(:,:,2) + T(8)*Image(:,:,3) + T(11);
   B = T(3)*Image(:,:,1) + T(6)*Image(:,:,2) + T(9)*Image(:,:,3) + T(12);
   AddWhite = -min(min(min(R,G),B),0);
   Scale = max(max(max(R,G),B)+AddWhite,1);
   R = (R + AddWhite)./Scale;
   G = (G + AddWhite)./Scale;
   B = (B + AddWhite)./Scale;
   Image(:,:,1) = R;
   Image(:,:,2) = G;
   Image(:,:,3) = B;
end
% Clip to [0,1]
Image = min(max(Image,0),1);
return;



function Image = xyz(Image,SrcSpace)
% Convert to CIE XYZ from 'SrcSpace'
WhitePoint = [0.950456,1,1.088754];  
switch SrcSpace
case 'xyz'
   return;
case 'luv'
   % Convert CIE L*uv to XYZ
   WhitePointU = (4*WhitePoint(1))./(WhitePoint(1) + 15*WhitePoint(2) + 3*WhitePoint(3));
   WhitePointV = (9*WhitePoint(2))./(WhitePoint(1) + 15*WhitePoint(2) + 3*WhitePoint(3));
   L = Image(:,:,1);
   Y = (L + 16)/116;
   Y = invf(Y)*WhitePoint(2);
   U = Image(:,:,2)./(13*L + 1e-6*(L==0)) + WhitePointU;
   V = Image(:,:,3)./(13*L + 1e-6*(L==0)) + WhitePointV;
   Image(:,:,1) = -(9*Y.*U)./((U-4).*V - U.*V);                  % X
   Image(:,:,2) = Y;                                             % Y
   Image(:,:,3) = (9*Y - (15*V.*Y) - (V.*Image(:,:,1)))./(3*V);  % Z
case {'lab','lch'}
   Image = lab(Image,SrcSpace);
   % Convert CIE L*ab to XYZ
   fY = (Image(:,:,1) + 16)/116;
   fX = fY + Image(:,:,2)/500;
   fZ = fY - Image(:,:,3)/200;
   Image(:,:,1) = WhitePoint(1)*invf(fX);  % X
   Image(:,:,2) = WhitePoint(2)*invf(fY);  % Y
   Image(:,:,3) = WhitePoint(3)*invf(fZ);  % Z
otherwise   % Convert from some gamma-corrected space
   % Convert to Rec. 701 R'G'B'
   Image = rgb(Image,SrcSpace);
   % Undo gamma correction
   R = invgammacorrection(Image(:,:,1));
   G = invgammacorrection(Image(:,:,2));
   B = invgammacorrection(Image(:,:,3));
   % Convert RGB to XYZ
   T = inv([3.240479,-1.53715,-0.498535;-0.969256,1.875992,0.041556;0.055648,-0.204043,1.057311]);
   Image(:,:,1) = T(1)*R + T(4)*G + T(7)*B;  % X 
   Image(:,:,2) = T(2)*R + T(5)*G + T(8)*B;  % Y
   Image(:,:,3) = T(3)*R + T(6)*G + T(9)*B;  % Z
end
return;

function Image = hsv(Image,SrcSpace)
% Convert to HSV
Image = rgb(Image,SrcSpace);
V = max(Image,[],3);
S = (V - min(Image,[],3))./(V + (V == 0));
Image(:,:,1) = rgbtohue(Image);
Image(:,:,2) = S;
Image(:,:,3) = V;
return;

function Image = hsl(Image,SrcSpace)
% Convert to HSL 
switch SrcSpace
case 'hsv'
   % Convert HSV to HSL   
   MaxVal = Image(:,:,3);
   MinVal = (1 - Image(:,:,2)).*MaxVal;
   L = 0.5*(MaxVal + MinVal);
   temp = min(L,1-L);
   Image(:,:,2) = 0.5*(MaxVal - MinVal)./(temp + (temp == 0));
   Image(:,:,3) = L;
otherwise
   Image = rgb(Image,SrcSpace);  % Convert to Rec. 701 R'G'B'
   % Convert R'G'B' to HSL
   MinVal = min(Image,[],3);
   MaxVal = max(Image,[],3);
   L = 0.5*(MaxVal + MinVal);
   temp = min(L,1-L);
   S = 0.5*(MaxVal - MinVal)./(temp + (temp == 0));
   Image(:,:,1) = rgbtohue(Image);
   Image(:,:,2) = S;
   Image(:,:,3) = L;
end
return;

function Image = lab(Image,SrcSpace)
% Convert to CIE L*a*b* (CIELAB)
WhitePoint = [0.950456,1,1.088754];
switch SrcSpace
case 'lab'
   return;
case 'lch'
   % Convert CIE L*CH to CIE L*ab
   C = Image(:,:,2);
   Image(:,:,2) = cos(Image(:,:,3)*pi/180).*C;  % a*
   Image(:,:,3) = sin(Image(:,:,3)*pi/180).*C;  % b*
otherwise
   Image = xyz(Image,SrcSpace);  % Convert to XYZ
   % Convert XYZ to CIE L*a*b*
   X = Image(:,:,1)/WhitePoint(1);
   Y = Image(:,:,2)/WhitePoint(2);
   Z = Image(:,:,3)/WhitePoint(3);
   fX = f(X);
   fY = f(Y);
   fZ = f(Z);
   Image(:,:,1) = 116*fY - 16;    % L*
   Image(:,:,2) = 500*(fX - fY);  % a*
   Image(:,:,3) = 200*(fY - fZ);  % b*
end
return;

function Image = luv(Image,SrcSpace)
% Convert to CIE L*u*v* (CIELUV)
WhitePoint = [0.950456,1,1.088754];
WhitePointU = (4*WhitePoint(1))./(WhitePoint(1) + 15*WhitePoint(2) + 3*WhitePoint(3));
WhitePointV = (9*WhitePoint(2))./(WhitePoint(1) + 15*WhitePoint(2) + 3*WhitePoint(3));
Image = xyz(Image,SrcSpace); % Convert to XYZ
U = (4*Image(:,:,1))./(Image(:,:,1) + 15*Image(:,:,2) + 3*Image(:,:,3));
V = (9*Image(:,:,2))./(Image(:,:,1) + 15*Image(:,:,2) + 3*Image(:,:,3));
Y = Image(:,:,2)/WhitePoint(2);
L = 116*f(Y) - 16;
Image(:,:,1) = L;                        % L*
Image(:,:,2) = 13*L.*(U - WhitePointU);  % u*
Image(:,:,3) = 13*L.*(V - WhitePointV);  % v*
return;  

function Image = lch(Image,SrcSpace)
% Convert to CIE L*ch
Image = lab(Image,SrcSpace);  % Convert to CIE L*ab
H = atan2(Image(:,:,3),Image(:,:,2));
H = H*180/pi + 360*(H < 0);
Image(:,:,2) = sqrt(Image(:,:,2).^2 + Image(:,:,3).^2);  % C
Image(:,:,3) = H;                                        % H
return;

function Image = huetorgb(m0,m2,H)
% Convert HSV or HSL hue to RGB
N = size(H);
H = min(max(H(:),0),360)/60;
m0 = m0(:);
m2 = m2(:);
F = H - round(H/2)*2;
M = [m0, m0 + (m2-m0).*abs(F), m2];
Num = length(m0);
j = [2 1 0;1 2 0;0 2 1;0 1 2;1 0 2;2 0 1;2 1 0]*Num;
k = floor(H) + 1;
Image = reshape([M(j(k,1)+(1:Num).'),M(j(k,2)+(1:Num).'),M(j(k,3)+(1:Num).')],[N,3]);
return;

function H = rgbtohue(Image)
% Convert RGB to HSV or HSL hue
[M,i] = sort(Image,3);
i = i(:,:,3);
Delta = M(:,:,3) - M(:,:,1);
Delta = Delta + (Delta == 0);
R = Image(:,:,1);
G = Image(:,:,2);
B = Image(:,:,3);
H = zeros(size(R));
k = (i == 1);
H(k) = (G(k) - B(k))./Delta(k);
k = (i == 2);
H(k) = 2 + (B(k) - R(k))./Delta(k);
k = (i == 3);
H(k) = 4 + (R(k) - G(k))./Delta(k);
H = 60*H + 360*(H < 0);
H(Delta == 0) = nan;
return;

function Rp = gammacorrection(R)
Rp = real(1.099*R.^0.45 - 0.099);
i = (R < 0.018);
Rp(i) = 4.5138*R(i);
return;

function R = invgammacorrection(Rp)
R = real(((Rp + 0.099)/1.099).^(1/0.45));
i = (R < 0.018);
R(i) = Rp(i)/4.5138;
return;

function fY = f(Y)
fY = real(Y.^(1/3));
i = (Y < 0.008856);
fY(i) = Y(i)*(841/108) + (4/29);
return;

function Y = invf(fY)
Y = fY.^3;
i = (Y < 0.008856);
Y(i) = (fY(i) - 4/29)*(108/841);
return;