how i get a blue channel image from a rgb image ?
MATLAB: Convertion rgb image blue channel image
image
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Try this:
% Extract the individual red, green, and blue color channels.
redChannel = rgbImage(:, :, 1);greenChannel = rgbImage(:, :, 2);blueChannel = rgbImage(:, :, 3);% Now swap around in any way you want.
newRedChannel = greenChannel;newGreenChannel = blueChannel; newBlueChannel = redChannel;% Recombine separate color channels into a single, true color RGB image.
NewRgbImage = cat(3, newRedChannel, newGreenChannel, newBlueChannel);That's not a gray scale image you attached, it's an RGB image. So try this
rgbImage = imread('C1fig.jpg');whos rgbImagesubplot(2, 1, 1);imshow(rgbImage);title('Original RGB image C1fig.jpg');axis('on', 'image');impixelinfomask = rgbImage(:, :, 1) == 0;% Extract the individual red, green, and blue color channels.
redChannel = rgbImage(:, :, 1);greenChannel = rgbImage(:, :, 2);blueChannel = rgbImage(:, :, 3);redChannel(mask) = 255;greenChannel(mask) = 0;blueChannel(mask) = 0;% Recombine separate color channels into a single, true color RGB image.
rgbImage = cat(3, redChannel, greenChannel, blueChannel);subplot(2, 1, 2);imshow(rgbImage);axis('on', 'image');impixelinfotitle('Altered RGB image');
If it really is a gray scale image, you can try this:
grayImage = imread('C1fig.jpg');if ndims(grayImage) == 3; grayImage = rgb2gray(grayImage);endwhos grayImagesubplot(2, 1, 1);imshow(grayImage);title('Original image C1fig.jpg');axis('on', 'image');impixelinfomask = grayImage == 0;% Initialize the individual red, green, and blue color channels.
redChannel = grayImage;greenChannel = grayImage;blueChannel = grayImage;redChannel(mask) = 255;greenChannel(mask) = 0;blueChannel(mask) = 0;% Recombine separate color channels into a single, true color RGB image.rgbImage = cat(3, redChannel, greenChannel, blueChannel);subplot(2, 1, 2);imshow(rgbImage);axis('on', 'image');impixelinfotitle('Altered RGB image');
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