MATLAB based Lift, Gamma, Gain LUT slope generator for 10-bit imaging

generate_10_bit_Scale.m

% Idiot proof snippet of code to generate a scale of 0-max 10 bit values in MATLAB.

col_1 = [0:1:1023];
Ten_bit_vals= [col_1 col_1];
display(Ten_bit_vals)

lgm_runtime.m

% MATLAB bumper script to run the dependency 'lift_gamma_gain.m'
% This script is used to emulate the mathematical effects of the
% lift, gamma and gain color correction method and the graphical
% effect it has on a 1D LUT for color correction. This script requires
% two dependencies, `lift_gamma_gain.m` and `10_bit_vals.txt`.
% 10_bit_vals.txt is simply a dual column text file with numbers
% ranged 0-1023 in each column.

% Jordan Westhoff, RIT 2014


 figure;
 lift = 0;
 gamma = 1;
 gain = 1;

 lift_gamma_gain(lift,gamma, gain);

while 1:6

lgg = menu('Modify LIFT, GAMMA or GAIN', 'Increase Lift', 'Decrease Lift',...
    'Increase Gamma', 'Decrease Gamma', 'Increase Gain', 'Decrease Gain', 'Terminate');


if lgg == 1;
    lift = lift+10;
    close
    figure;
    lift_gamma_gain(lift,gamma, gain);
end

if lgg == 2;
    lift = lift-10;
        close
    figure;
    lift_gamma_gain(lift,gamma, gain);
end

if lgg == 3;
    gamma = (gamma+0.1);
        close
    figure;
    lift_gamma_gain(lift,gamma, gain);
end

if lgg == 4;
    gamma = (gamma-0.1);
    close
    figure;
    lift_gamma_gain(lift,gamma, gain);
end

if lgg == 5;
    gain = (gain+.02);
        close
    figure;
    lift_gamma_gain(lift,gamma, gain);
end

if lgg == 6;
    gain = (gain-.02);
        close
    figure;
    lift_gamma_gain(lift,gamma, gain);
end

if lgg == 7
    break
end

end

lift_gamma_gain.m

function lift_gamma_gain(lift, gamma, gain, scale)


% Jordan Westhoff, 2014
% USAGE
%   Insert a variable 1 in the fourth place of the input
%
%   This script is used to emulate the mathematical effects of the
%   lift, gamma and gain color correction method and the graphical
%   effect it has on a 1D LUT for color correction.

% TEST
    % lift = 0
    % gamma = 2.2
    % gain = 1

% This is the calculator for lift, gamma, gain
%   For lift, increment in values of 1
%   For gamma, increment in values of .2
%   For gain, increment in values of 1

% OUT = GAIN * (( IN ^ GAMMA) + OFFSET )
% can also be
% OUT = GAIN*((IN + LIFT)^GAMMA)

unity = load('10_bit_vals.txt');
in = (unity(:,2));

in = in / (max(in));
lift = lift / 1024;


gam_1 = (in .^ gamma);
gam_2 = (gam_1 + lift);
gam_3 = gain * gam_2;

OUT = gam_3;

if nargin == 3;
    in = in;
    OUT = OUT;
    high = 1.00;
    OUT(OUT>high) = high;
    low = 0.00;
    OUT(OUT<low) = low;

else nargin == 4;
    in = in * 1024;
    OUT = OUT * 1024;
    high = 1024;
    OUT(OUT>high) = high;
    low = 0.00;
    OUT(OUT<low) = low;
end



    plot(in, in, 'b-');
    hold on;
    plot(in, OUT, 'r-');
    title('Lift, Gamma, Gain - Primary Color Correcter');
    legend('Unity LUT', 'Corrected LUT');

end