I need a way to assign a value for each pixel based on RGB values. which will be based on equations for red,blue and green

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Nasser Jarrar 2018-2-26

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编辑： Matt 2018-2-26

So for blue (0-255) it will have a value between 0 and 10 for green (0-255) it will have a value between 10 and 20 for red (0-255) it will have a value between 20 and 90. And when a pixel is selected I want get the value based on the equations based on the pixel's RGB values.

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Geoff Hayes 2018-2-26

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Nasser - are you assigning one value for each pixel? How would you convert or assign the value for

(70, 140, 210) ---> (R, G, B)

What equations are you using to map (say) the 210 to a value between 0 and 10?

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Answer 1

Matt 2018-2-26

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编辑：Matt 2018-2-26

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The imread function in MATLAB does something like this. It will output a matrix with rows, columns (each element corresponding to a pixel) and 3 pages. Each page corresponds to a primary color present in the image: red, green and blue.

A = imread('ngc6543a.jpg');
imshow(A)
R = A(:,:,1);
G = A(:,:,2);
B = A(:,:,3);
figure
subplot(2,2,1)
imshow(R)
subplot(2,2,2)
imshow(G)
subplot(2,2,3)
imshow(B)