MATLAB: Gray image to rgb image

gray to rgbImage Processing Toolbox

I converted a color image to gray using rgb2gray and denoised the image. Now i wanted to convert the denoised gray image to a color image… Is it possible…. Please can someone help me…. Please do reply….

Best Answer

You can use ind2rgb() but you have to supply a colormap. It won't look like the original colors though - you lost those when you went to gray. Why don't you just denoise each channel one at a time? Or convert to hsv and denoise just the v channel. Either of those methods will not lose the color information like your method does.

I posted a demo here: Salt and pepper noise removal in a color image

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MATLAB: Overlay binary image on RGB image

Is this?

RGB_image=imread('image_test.jpg');
subplot(311);imshow(RGB_image);
bw_image=im2bw(rgb2gray(RGB_image));
subplot(312);imshow(bw_image);
result=imfuse(RGB_image,bw_image);
subplot(313);imshow(result);

Detail documentation here

MATLAB: Ycbcr to grayscale?

Note that there are many ways of converting colour to greyscale. Any weighted sum of the colour components can be a greyscale conversion.

Your Y component of the ycbcr triplet is already such a weighted sum. So you could just use that as a greyscale image.

Otherwise, you can always

rgb2gray(ycbcr2rgb(yourimage))

edit: an r was missing. Thanks Image Analyst

Best Answer

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MATLAB: Overlay binary image on RGB image

MATLAB: Ycbcr to grayscale?

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