MATLAB: Part color part black and white

grayscale color images

I have a grayscale image. I want to change some pixels to colored pixels. How do I do that? thanks

Best Answer

You need to convert the grayscale to equivalent (gray-toned) RGB image, after which you can add color to the image.

newRGBimage = YourGrayImage(:,:,[1 1 1]);   %a fast way of copying the image to three color planes
newRGBimage(:,[1 end], 1) = 255;   %draw a red left and right border

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MATLAB: Separate the red part of imge

A naive approach would be to extract "red" colors from the image:

I = imread('peppers.png');
R = I(:,:,1);
G = I(:,:,2);
B = I(:,:,3);
% Here I am naively defining "red" as the red layer being greater than
% some threshold and the blue and green layers being less than that threshold
thold = 100;
mask = R>thold & G<thold & B<thold;
R(~mask) = 255;
G(~mask) = 255;
B(~mask) = 255;
J = cat(3,R,G,B);
figure; montage(cat(4,I,J),'Size',[1 2]);

More advanced approaches exists (google "image segmentation"). For instance, see the MATLAB example for color-based segmentation using k-means clustering.

MATLAB: Rotate part of an image

https://www.mathworks.com/help/images/ref/imrotate.html

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MATLAB: Separate the red part of imge

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