rgbe2rgb.m
1ba0b9dff245Bashardoust_SystCoord

rgbe2rgb.m
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			function rgb = rgbe2rgb(rgbe)
			%rgbe2rgb Convert RGBE values to floating-point RGB.
			% RGB = RGBE2RGB(RGBE) converts an arry of (R,G,B,E) encoded values to
			% an array of floating-point (R,G,B) high dynamic range values.
			%
			% Reference: Ward, "Real Pixels" (pp. 80-83) in Arvo "Graphics Gems II," 1991.

			% Copyright 2007-2013 The MathWorks, Inc.

			dims = size(rgbe);

			% Separate the 1-D scanline into separate columns of (R,G,B,E) values.
			rgbe = reshape(rgbe, dims(1), 4);

			rgb = bsxfun(@times, single(rgbe(:, 1:3)) ./ 256, ...
			2.^(single(rgbe(:,4)) - 128));

			% Esnure that (0,0,0,0) maps to (0,0,0).
			mask = max(rgbe, [], 2) == 0;
			rgb(mask,:) = 0;

			% Separate into color planes suitable for storage.
			rgb = reshape(rgb, [dims(1), 1, 3]);