Searching for Yellow Error, And is this the right way to write the 'if' Statement

Im trying to have it search for the color yellow on a black background and this code doesn't function how I thought it would. The print statement was just a test so I could see if it was finding a yellow pixel but it seems to print out the statment regardless. Eventually I want it to be able to pick up a yellow ball with a little more chaotic of a background tho.

%Error in imageUpload (line 12)

% Red = [R(x,y)];

I = imread('yellow.jpg');

imshow(I)

A = imread('yellow.jpg');

R = A(:,:,1);

G = A(:,:,2);

B = A(:,:,3);

for x = 1:720

x = x+1;

for y = 1:720

y = y+1;

Red = [R(x,y)];

Gre = [G(x,y)];

Blu = [B(x,y)];

if Red > 150 && Gre > 150 && Blu < 150

fprintf("i")

else

end

end

end

Answer 1

[Mahesh Taparia]

Hi

I assume, you want to find the pixels which satisfy the condition mentioned in your code. You can change your code to the below code:

A = imread('yellow.jpg');
R = A(:,:,1); 
G = A(:,:,2); 
B = A(:,:,3);
finalImage = zeros(720,720);
for x = 1:720
    for y = 1:720
        Red = [R(x,y)];
        Gre = [G(x,y)];
        Blu = [B(x,y)];
        finalImage(x,y) = (Red > 150)&&(Gre > 150)&&(Blu < 150);     
    end 
end

Hope it will help!