MATLAB: Change the black of grayscale image into color

burn colored overlay into imagecolorImage Processing Toolbox

Hallo I gernerated with "bwperim" borders around my particles and switched them to black instead of white with a black background.

I would like to visualize the difference between multiple images by diffrent colors. Right now all the images are black and white.

how can I change the black sourrounding into a diffrent color for each picture?

Best Answer

Threshold or somehow segment your images to get a mask of the "black" parts, then use

rgbImage = imoverlay(grayImage, mask, yourColor);

where yourColor is a 3 element array where each number of the fraction from black to bright for red, green, and blue, like [0.3, 0.6, 0.9] or whatever.

Related Solutions

MATLAB: I want code to convert color image to rgb color spaces exactly

X = im2double(imread('images.jpg'));
R = X(:,:,1);
G = X(:,:,2);
B = X(:,:,3);
z = zeros(size(R));
Rimg = cat(3, R, z, z);
Gimg = cat(3, z, G, z);
Bimg = cat(3, z, z, B);
L256 = linspace(0,1,256).';
z256 = zeros(256,1);
mapR = [L256, z256, z256];
mapG = [z256, L256, z256];
mapB = [z256, z256, L256];
figure; image(Rimg); colormap(mapR); colorbar();
figure; image(Gimg); colormap(mapG); colorbar();
figure; image(Bimg); colormap(mapB); colorbar();

MATLAB: Problem of color display in an image

Try this:

s = load('img.mat')
rgbImage = s.img;
subplot(1, 2, 1);
imshow(rgbImage)
impixelinfo
title('Original Image', 'FontSize', 20);
% Extract the individual red, green, and blue color channels.
redChannel = rgbImage(:, :, 1);
greenChannel = rgbImage(:, :, 2);
blueChannel = rgbImage(:, :, 3);
blackMask = redChannel == 0 & greenChannel == 0 & blueChannel == 0;
redChannel(blackMask) = 255;
greenChannel(blackMask) = 0;
blueChannel(blackMask) = 0;
% Recombine separate color channels into a single, true color RGB image.
rgbImage = cat(3, redChannel, greenChannel, blueChannel);
subplot(1, 2, 2);
imshow(rgbImage);
title('Now with black made red', 'FontSize', 20);

Best Answer

Related Solutions

MATLAB: I want code to convert color image to rgb color spaces exactly

MATLAB: Problem of color display in an image

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