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% FUNCTION IM = C2IMAGE(A)
%
% Returns a RGB image of complex array A where
% the phase is mapped to hue, and the amplitude
% is mapped to brightness.
%*-----------------------------------------------------------------------*
%|                                                                       |
%|  Except where otherwise noted, this work is licensed under a          |
%|  Creative Commons Attribution-NonCommercial-ShareAlike 4.0            |
%|  International (CC BY-NC-SA 4.0) license.                             |
%|                                                                       |
%|  Copyright (c) 2017 by Paul Scherrer Institute (http://www.psi.ch)    |
%|                                                                       |
%|      Author: CXS group, PSI  |
%*-----------------------------------------------------------------------*
% You may use this code with the following provisions:
%
% If the code is fully or partially redistributed, or rewritten in another
% computing language this notice should be included in the redistribution.
%
% If this code, or subfunctions or parts of it, is used for research in a
% publication or if it is fully or partially rewritten for another
% computing language the authors and institution should be acknowledged
% in written form in the publication: “Data processing was carried out
% using the “cSAXS matlab package” developed by the CXS group,
% Paul Scherrer Institut, Switzerland.”
% Variations on the latter text can be incorporated upon discussion with
% the CXS group if needed to more specifically reflect the use of the package
% for the published work.
%
% A publication that focuses on describing features, or parameters, that
% are already existing in the code should be first discussed with the
% authors.
%
% This code and subroutines are part of a continuous development, they
% are provided “as they are” without guarantees or liability on part
% of PSI or the authors. It is the user responsibility to ensure its
% proper use and the correctness of the results.
function im = c2image(a, varargin)
if ismatrix(a)
absa = abs(a);
phasea = angle(a);
% (optional second argument can switch between various plotting modes)
abs_range = [];
if nargin==2
m = varargin{1};
elseif nargin==3
m = varargin{1};
abs_range = varargin{2};
else
m = 1;
end
if isempty(abs_range)
nabsa = absa/max(max(absa));
else
nabsa = (absa - abs_range(1))/(abs_range(2) - abs_range(1));
nabsa(nabsa < 0) = 0;
nabsa(nabsa > 1) = 1;
end
switch m
case 1
im_hsv = zeros([size(a) 3]);
im_hsv(:,:,1) = mod(phasea,2*pi)/(2*pi);
im_hsv(:,:,2) = 1;
im_hsv(:,:,3) = nabsa;
im = hsv2rgb(im_hsv);
case 2
im_hsv = ones([size(a) 3]);
im_hsv(:,:,1) = mod(phasea,2*pi)/(2*pi);
im_hsv(:,:,2) = nabsa;
im = hsv2rgb(im_hsv);
end
elseif ndims(a)==3
sz = size(a);
im_hsv = zeros([sz 3]);
im = zeros([sz 3]);
for ii=1:sz(3)
absa = abs(a(:,:,ii));
phasea = angle(a(:,:,ii));
% (optional second argument can switch between various plotting modes)
abs_range = [];
if nargin==2
m = varargin{1};
elseif nargin==3
m = varargin{1};
abs_range = varargin{2};
else
m = 1;
end
if isempty(abs_range)
nabsa = absa/max(max(absa));
else
nabsa = (absa - abs_range(1))/(abs_range(2) - abs_range(1));
nabsa(nabsa < 0) = 0;
nabsa(nabsa > 1) = 1;
end
switch m
case 1
im_hsv(:,:,ii,1) = mod(phasea,2*pi)/(2*pi);
im_hsv(:,:,ii,2) = 1;
im_hsv(:,:,ii,3) = nabsa;
case 2
im_hsv(:,:,ii,1) = mod(phasea,2*pi)/(2*pi);
im_hsv(:,:,ii,2) = nabsa;
end
im(:,:,ii,:) = hsv2rgb(squeeze(im_hsv(:,:,ii,:)));
end
end
end