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diff --git a/chromakey/prj_load.m b/chromakey/prj_load.m
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+## Copyright (C) 2020 Jens
+## 
+## This program is free software: you can redistribute it and/or modify it
+## under the terms of the GNU General Public License as published by
+## the Free Software Foundation, either version 3 of the License, or
+## (at your option) any later version.
+## 
+## This program is distributed in the hope that it will be useful, but
+## WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU General Public License for more details.
+## 
+## You should have received a copy of the GNU General Public License
+## along with this program.  If not, see
+## <https://www.gnu.org/licenses/>.
+
+## -*- texinfo -*- 
+## @deftypefn {} {@var{retval} =} prj_load (@var{input1}, @var{input2})
+##
+## @seealso{}
+## @end deftypefn
+
+## Author: Jens <jens@orion>
+## Created: 2020-10-04
+
+function [im_rgb, ref_rgb] = prj_load(prj_name)
+extensions = {'.png'};
+name_im = ''
+for i=1:length(extensions),
+	ext = extensions{i}
+	name_cand = strcat(prj_name, ext)
+	if isfile(name_cand)
+		name_im = name_cand;
+		break;	
+		
+	end;
+end;
+
+if isempty(name_im)
+	error("File Not found")
+end
+
+[im, m, a] = imread(name_im);
+if length(a) == 0
+	error("Alpha channel not found")
+end
+
+# Get image dimensions
+[w, h, nc] = size(im)
+
+# Get RGBA data
+im_rgb = im2double(im);
+im_a = im2double(a);
+
+# Find background sample area in alpha channel
+# And create reference data
+ref_sample_indices = find(im_a < 0.5);
+zzz = reshape(im_rgb, w*h, nc);
+ref = mean(zzz(ref_sample_indices, :))
+ref_rgb = toRef(ref, size(im_rgb));	
+
+function r = toRef(ref, d)
+	r = repmat(reshape(ref,1, 1, 3), d(1), d(2));
+endfunction
+	
+endfunction