CODEWITHSUNDEEP
matlab
amrita
amrita

Reputation: 133

rgb of an image

To get RGB values:

RGB = imread('C:\Documents and Settings\student2\Desktop\Water lilies.jpg');
R = RGB(:, :, 1);
G = RGB(:, :, 2);
B = RGB(:, :, 3);

Can someone tell me why we use 1, 2, and 3 to get Red, Green, and Blue matrices respectively?

Upvotes: 3

Views: 2351

Answers (1)

Richante
Richante

Reputation: 4388

If you look at the size of RBG: size(RGB), you will see that it is width X height X 3. Each pixel is represented by 3 values - red, green, and blue; the actual colour of the pixel is a mixture of these primary colour - Wikipedia.

If you want to know the reason why R is 1, G is 2 and B is 3, rather than R being 3 and B being 1 or something, it is just convention. I assume because red light is a lower frequency of light, blue is higher and green is in between - Wikipedia.

Upvotes: 3

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