I have an image with black background, which I got from imfreehand function. I want to change that black background to red. Following is link for image.
MATLAB: How to change image background to red
image processingImage Processing Toolbox
Related Solutions
Try this:
rgbImage = imread('image.jpeg');subplot(2, 1, 1);imshow(rgbImage);% Extract the individual red, green, and blue color channels.
redChannel = rgbImage(:, :, 1);greenChannel = rgbImage(:, :, 2);blueChannel = rgbImage(:, :, 3);% Get the yellow mask
yellowMask = redChannel > 128 & greenChannel > 128;% Get the white mask
whiteMask = redChannel > 128 & greenChannel > 128 & blueChannel > 128;% Make yellow mask green
redChannel(yellowMask) = 0;greenChannel(yellowMask) = 255;blueChannel(yellowMask) = 0;% Make the white mask blue
redChannel(whiteMask) = 0;greenChannel(whiteMask) = 0;blueChannel(whiteMask) = 255;% Recombine separate color channels into a single, true color RGB image.
rgbImage2 = cat(3, redChannel, greenChannel, blueChannel);subplot(2, 1, 2);imshow(rgbImage2);
Something like
grayImage = zeros(20,20, 'uint8');grayImage(10:14, 4:12) = 255;imshow(grayImage, []);Related Question
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