%% Example code for reading hyperspectral image from EXR file
% input: .exr file
% Output: RGB, HSI
%  - RGB: linear sRGB image (nrows x ncols x 3)
%  - HSI: hyperspectral image (nrows x ncols x 31)

%% 
% file to read
fn = '../exr/scene01_reflectance.exr';

% read exr file
% please refer to 'openexr-matlab' github repository for 'exrreadchannels'
% https://github.com/KAIST-VCLAB/openexr-matlab
mapObj = exrreadchannels(fn);

% get linear sRGB image (RGB)
RGB(:,:,1) = mapObj('R');
RGB(:,:,2) = mapObj('G');
RGB(:,:,3) = mapObj('B');

% get hyperspectral image (HSI)
wvls2b = 420:10:720;
for i=1:length(wvls2b)
    HSI(:,:,i) = mapObj(sprintf('w%dnm', wvls2b(i)));    
end