MATLAB: How to remove G from RGB image

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How would you remove G from an RGB image?

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This is for a project and the purpose of this specific task is to see the effects of removing a channel from an image. My professor asks that we create a new matrix that does not include the green color values I am not sure whether he means complete removal of the channel or setting it to 0. He gives an example of what the image is suppose to look like before and after and once he creates the new image (picture of a man), the man is purple.

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MATLAB: Change specific color in an image to another one

This is a tough problem. Since you are using a raster image, objects that look purple are actually many small variations of purple. One thing you could try to do is compute which colors are purple-ish, and then modify those colors in the colormap.

Here is an example that may yield slightly better results than what you were experiencing, but still not perfect:

% Read image
[I,m] = imread('iteration31.png');
% Find purple-ish colors
mask1 = abs(m(:,3)-m(:,1))<0.8;
mask2 = abs(m(:,3)-m(:,2))>0.3;
mask3 = abs(m(:,2)-m(:,1))>0.3;
mask = mask1 & mask2 & mask3;
% Convert purple-ish colors to green-ish colors
m(mask,:) = 1-m(mask,:);
% Create and show newly colored image
rgb = ind2rgb(I,m);
imshow(rgb);

MATLAB: How to do Contrast Enhancement of color image

Not sure what you mean by that. But there are several possibilities. You could convert the image to hsv color space with rgb2hsv, then use imadjust on the v channel, and convert back to RGB with hsv2rgb.

Or you could do the same thing on the s channel to make the colors more vivid.

Or you could use imfilter on the v channel to enhance edges.

These all produce different effects.

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MATLAB: Change specific color in an image to another one

MATLAB: How to do Contrast Enhancement of color image

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