MATLAB: How to color objects red

color segmentationImage Processing Toolboxspecify object color

I know I can use the command label2rgb to color the objects with specified color maps but how would I go about making all objects red in an image?

Thank you in advance for any help that is provided.

Best Answer

relabeled = uint8(labeled_image > 0);
colormap = [0 0 0; 1 0 0]; %black and red
coloredimage = label2rgb(relabeled, colormap);

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MATLAB: How to change white background to black and black foreground to white

The logical not operator is ~ (or you can use not):

invertedI = ~BW
%or
invertedI = not(BW)

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

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MATLAB: How to change white background to black and black foreground to white

MATLAB: Problem of color display in an image

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