Image:Barn grand tetons rgb separation.jpg

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Size of this preview: 200 × 598 pixels
Full resolution‎ (1,600 × 4,780 pixels, file size: 1.03 MB, MIME type: image/jpeg)

[edit] Summary

This takes an image (Image:Barns grand tetons.jpg) and displays the red, green and blue elements extracted from it.

Note that the white snow is composed of strong red, green and blue; the brown barn is composed of strong red and green with little blue; the dark green grass is composed of strong green with little red or blue; and the light blue sky is composed of strong blue and moderately strong red and green.

[edit] Generator code

In MATLAB:

RGBimage = imread('barns_grand_tetons.jpg');
[height,width,depth]=size(RGBimage);

% Newer versions of matlab need outputimage=zeros(height*4,width,depth,'uint8');
outputimage=uint8(zeros(height*4,width,depth));
for w=1:width,
  for h=1:height,
    outputimage(h,w,1) = RGBimage(h,w,1); %Copy R, G and B for normal image
    outputimage(h,w,2) = RGBimage(h,w,2);
    outputimage(h,w,3) = RGBimage(h,w,3);
    outputimage(h+height,w,1) = RGBimage(h,w,1); %Copy R only for first component
    outputimage(h+(2*height),w,2) = RGBimage(h,w,2); %G only for second component
    outputimage(h+(3*height),w,3) = RGBimage(h,w,3); %B only for third component
  end
end

image(outputimage);

imwrite(outputimage,'rgb_separation.jpg','jpeg');

[edit] Licensing

Based on the (public domain) photo Image:Barns grand tetons.jpg. Code above and resulting output by Mike1024.

This work has been released into the public domain by the copyright holder. This applies worldwide. In case this is not legally possible: The copyright holder grants any entity the right to use this work for any purpose, without any conditions, unless such conditions are required by law.

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