separating rgb values of an image

Question

Matpar 2019-8-30

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/478326-separating-rgb-values-of-an-image

评论： Walter Roberson 2019-8-31

在 MATLAB Online 中打开

Hi all

can someone tell me where i am going wrong?

I have my code, I want to separate the r g b values of the image! so for example if the image is 245x984x345

the r b g value will be separated such as it may have 100 red values 345 blue and the rest green.

when i try displaying the variables r g b separately the image are of various shades of gray!

i am not sure what is happening!

Please assist!

%Exercise 1
im = imread('scr.jpg');
whos im
r=im(:,:,1);
g=im(:,:,2);
b=im(:,:,3);
imshow(r);
figure;
imshow(r),title('Red values displayed');
figure;
imshow(g),title('Green values displayed');
figure;
imshow(b),title('Blue values displayed');
figure;
whos
%Exercise 2
g1=r+g+b/3;
imshow(g1),title('g1 Generic Average Formula');
figure;
%Exercise 3
g2=0.3*r+0.59*g+0.11*b/3;
imshow(g2),title('g2 Actual Average Formula');
figure;
subplot(2,2,1),imshow(im),title('original image');
subplot(2,2,2),imshow(r),title('red plane');
subplot(2,2,3),imshow(g),title('green plane');
subplot(2,2,4),imshow(b),title('blue plane');

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Answer 1

Walter Roberson 2019-8-30

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/478326-separating-rgb-values-of-an-image#answer_389844

在 MATLAB Online 中打开

z = zeros(size(img));
r = z; r(:,:,1) = img(:,:,1);
g = z; g(:,:,2) = img(:,:,2);
b = z; b(:,:,3) = img(:,:,3);

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Matpar 2019-8-30

Sad faces WR,

it didn't work, i implemented it and disp() and imshow() after every line to see what was actually happening! i am not getting the image of red green blue, it displays a block of red green blue!

this should show the image of a scorpion in red green and blue, i should have three colours of a scorpion which is red green blue..

i am getting three rectangles of the colours rgb!

suggestions?

thanx in advance for responding!