Turning an image into grayscale and Deuteranomaly scale in Matlab

[poster]

I want to turn an image from its original RGB scale to grayscale and deuteranomaly. However, every attempt I try gives me somewhat darker image that does not truly display grayscale.My attempt for grayscale
here is what im running

whe = imread('CoWheel.png');



whesi = size(whe);





red = [];

gree = [];

blue = [];



for i = 1:whesi(1)

    for j = 1:whesi(2)

        red(i,j) = whe(i,j,1);

        gree(i,j) = whe(i,j,2);

        blue(i,j) = whe(i,j,3);

    end

end



gray = whe;

for i = 1:whesi(1)

    for j = 1:whesi(2)



        gray(i,j,1) = gray(i,j,1)*.2989;

        gray(i,j,2) = gray(i,j,2)*.5870;

        gray(i,j,3) = gray(i,j,3)*.1141;



    end

And as for the deuteranomaly, I would have no clue into what to do to make that. Any help would be appreciated.

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