Hi all,
I would like to know how to convert binary image to RGB. Let say, I want WHITE become RED and BLACK become GREEN. Anyone can help me please…really need any suggestion.
Thank you
MATLAB: Binary image to RGB image
binarycolorizeImage Processing Toolboxmask
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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');I don't know what your assignment is exactly trying to get you to do. They seem to be strangely formulated.
I think that by now you should know how to avoid for loops. You can operate at once on the whole image:
%don't use image as a variable name, it's already a matlab function
%img: input image loaded in matlab:
red = img(:, :, 1);green = img(:, :, 2);blue = img(:, :, 3);%create a mask same size as image that indicates 'yellow' pixels
isyellow = red > 200 & red < 250 & green > 200 & green < 250 & blue > 200 & blue < 250%set red and blue channel to 0 when image is yellow. set green channel to max
%no idea if that's what asked by the assignment
red(isyellow) = 0;green(isyellow) = 255;blue(isyellow) = 0;%recombine all channels
newimg = cat(3, red, green, blue);imshow(newimg);
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