Change the black of grayscale image into color
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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?
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/473407/image.jpeg)
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Image Analyst
2020-12-29
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.
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Walter Roberson
2020-12-29
mask = ~YourLogicalMap;
MapR = mask .* ColorForRed;
MapG = mask .* ColorForGreen;
MapB = mask .* ColorForBlue;
MapRGB = cat(3, MapR, MapG, MapB);
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