i have following code of image extraxtion but i got gray scale image output while giving input color image ,how could i get the color image output

a=imread('new2.png');

c=zeros(35,57,3)

e=zeros(35,57,3)

for i=1:35; for j=1:57; if a(i,j,1)>233 if a(i,j,1)<254 c(i,j,1)=a(i,j,1);

    for i=1:35;
    for j=1:57;
        if a(i,j,2)>25
            if a(i,j,2)<30
                c(i,j,2)=a(i,j,2);

    for i=1:35;
    for j=1:57;
        if a(i,j,3)>35
            if a(i,j,3)<40
                c(i,j,3)=a(i,j,3);
            end
        end
    end
end
            end
        end
            end
            end
            end
            end
            end
            end

e=logical(c) colormap(jet) image(e)

Answer 1

[Image Analyst]

I wouldn't do it that inefficient way at all. But that's another issue. Your problem is that you're casting your color image to a logical image, e, and then displaying that e instead of the color image c. Why are you doing that? Also, I apply a colormap after I've displayed the image, not before and I'm not sure if displaying an image will reinitialize the colormap.

I'd do it like this:

rgbImage=imread('new2.png');
% Display the original color image.
subplot(2, 3, 1);
imshow(rgbImage);
title('Original Color Image', 'FontSize', fontSize);
% Enlarge figure to full screen.
set(gcf, 'units','normalized','outerposition',[0 0 1 1]);

% Extract the individual red, green, and blue color channels.
redChannel = rgbImage(:, :, 1);
greenChannel = rgbImage(:, :, 2);
blueChannel = rgbImage(:, :, 3);
binaryImageR = redChannel > 233;
binaryImageG = redChannel > 25 & redChannel < 30;
binaryImageB = blueChannel > 35 & blueChannel < 40;
% Display the binary images.
subplot(2, 3, 2);
imshow(binaryImageR);
title('Red Binary Image', 'FontSize', fontSize);
subplot(2, 3, 3);
imshow(binaryImageG);
title('Green Binary Image', 'FontSize', fontSize);
subplot(2, 3, 4);
imshow(binaryImageB);
title('Red Binary Image', 'FontSize', fontSize);
% Combine
binaryImage = binaryImageR & binaryImageG & binaryImageB;
subplot(2, 3, 5);
imshow(binaryImage);
title('Overall Binary Image', 'FontSize', fontSize);

% Mask the image.
maskedRgbImage = bsxfun(@times, rgbImage, cast(binaryImage,class(rgbImage)));
subplot(2, 3, 6);
imshow(maskedRgbImage);
title('Masked Color Image', 'FontSize', fontSize);

[shantanu shukla]

thx for this