I created an overlapping image from two images, a and b; I get green-magenta colors:
I want to control the color output: for example, I want blue and red.
c=imfuse(a,b,'falsecolr','Scaling','joint');All suggestions are welcome
MATLAB: How to change color in overlapping image
falsecolorimageImage Processing Toolboxoverlapping
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Henrique, see the demo code below that I wrote to produce this figure:
% Demo to have the user freehand draw an irregular shape over
% a gray scale image, have it convert that portion to a
% color RGB image defined by a colormap.
clc; % Clear command window.
workspace; % Make sure the workspace panel is showing.
fontSize = 16;% Read in a standard MATLAB gray scale demo image.
folder = fullfile(matlabroot, '\toolbox\images\imdemos');baseFileName = 'cameraman.tif';% Get the full filename, with path prepended.
fullFileName = fullfile(folder, baseFileName);% Check if file exists.
if ~exist(fullFileName, 'file') % File doesn't exist -- didn't find it there. Check the search path for it.
fullFileName = baseFileName; % No path this time.
if ~exist(fullFileName, 'file') % Still didn't find it. Alert user.
errorMessage = sprintf('Error: %s does not exist in the search path folders.', fullFileName); uiwait(warndlg(errorMessage)); return; endendgrayImage = imread(fullFileName);imshow(grayImage, []);axis on;title('Original Grayscale Image', 'FontSize', fontSize);set(gcf, 'Position', get(0,'Screensize')); % Maximize figure.
message = sprintf('Left click and hold to begin drawing.\nSimply lift the mouse button to finish');uiwait(msgbox(message));hFH = imfreehand();% Create a binary image ("mask") from the ROI object.
binaryImage = hFH.createMask();xy = hFH.getPosition;% Now make it smaller so we can show more images.
subplot(2, 2, 1);imshow(grayImage, []);axis on;drawnow;title('Original Grayscale Image', 'FontSize', fontSize);% Display the freehand mask.
subplot(2, 2, 2);imshow(binaryImage);axis on;title('Binary mask of the region', 'FontSize', fontSize);% Convert the grayscale image to RGB using the jet colormap.
rgbImage = ind2rgb(grayImage, jet(256));% Scale and convert from double (in the 0-1 range) to uint8.
rgbImage = uint8(255*rgbImage);% Display the RGB image.
subplot(2, 2, 3);imshow(rgbImage);axis on;title('RGB Image from Jet Colormap', 'FontSize', fontSize);% Extract the red, green, and blue channels from the color image.
redChannel = rgbImage(:, :, 1);greenChannel = rgbImage(:, :, 2);blueChannel = rgbImage(:, :, 3);% Create a new color channel images for the output.
outputImageR = grayImage;outputImageG = grayImage;outputImageB = grayImage;% Transfer the colored parts.
outputImageR(binaryImage) = redChannel(binaryImage);outputImageG(binaryImage) = greenChannel(binaryImage);outputImageB(binaryImage) = blueChannel(binaryImage);% Convert into an RGB image
outputRGBImage = cat(3, outputImageR, outputImageG, outputImageB);% Display the output RGB image.
subplot(2, 2, 4);imshow(outputRGBImage);axis on;title('Output RGB Image', 'FontSize', fontSize);See this demo:
clc; % Clear the command window.
workspace; % Make sure the workspace panel is showing.
clearvars;format longg;format compact;fontSize = 20;% Read in a standard MATLAB color demo image.
folder = fullfile(matlabroot, '\toolbox\images\imdemos');baseFileName = 'peppers.png';% Get the full filename, with path prepended.
fullFileName = fullfile(folder, baseFileName);if ~exist(fullFileName, 'file') % Didn't find it there. Check the search path for it.
fullFileName = baseFileName; % No path this time.
if ~exist(fullFileName, 'file') % Still didn't find it. Alert user.
errorMessage = sprintf('Error: %s does not exist.', fullFileName); uiwait(warndlg(errorMessage)); return; endendrgbImage = imread(fullFileName);% Get the dimensions of the image. numberOfColorBands should be = 3.
[rows, columns, numberOfColorBands] = size(rgbImage);% Display the original color image.
subplot(2, 2, 1);imshow(rgbImage);title('Original Color Image', 'FontSize', fontSize);% Enlarge figure to full screen.
set(gcf, 'units','normalized','outerposition',[0 0 1 1]);% Find where the average is more than 250.
grayImage = rgb2gray(rgbImage);% Display the image.
subplot(2, 2, 2);imshow(grayImage);title('Gray Image', 'FontSize', fontSize);% Binarize (threshold) the image to find
% where the average is brighter than some threshold value.
thresholdValue = 200; % Change to whatever value you want.
binaryImage = grayImage > thresholdValue;% Display the image.subplot(2, 2, 3);imshow(binaryImage);caption = sprintf('Binary Image = gray image > %d', thresholdValue);title(caption, 'FontSize', fontSize);% Extract the individual red, green, and blue color channels.
redChannel = rgbImage(:, :, 1);greenChannel = rgbImage(:, :, 2);blueChannel = rgbImage(:, :, 3);% Make binary pixels red.
redChannel(binaryImage) = 255;greenChannel(binaryImage) = 0;blueChannel(binaryImage) = 0;% Get RGB image again.
newRGB = cat(3, redChannel, greenChannel, blueChannel);% Display the image.subplot(2, 2, 4);imshow(newRGB);title('New RGB Image', 'FontSize', fontSize);
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