Find index of unique pixel values and assign a color to the image. Original image is a grayscale.

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I have a grayscale image in which objects are represented as:
Object Pixel Value
Background 0
Class 1 1
Class 2 2
Class 3 3
Class 4 4
Class 5 5
There are no other pixel values except the 6 mentioned above. Background is essentially present, other objects may or may not be present.
The requirement is to assign specific colors to the objects
Object Pixel Value Color
Background 0 Black
Class 1 1 Red
Class 2 2 Green
Class 3 3 Blue
Class 4 4 White
Class 5 5 Pink
For an example, i am attaching an image with Background, Class 4 and Class 5

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Walter Roberson
Walter Roberson 2022-7-29
cmap = [
0 0 0 %black
1 0 0 %red
0 1 0 %green
0 0 1 %blue
1 1 1 %white
1 0 1 %fuschia
];
filename = 'https://www.mathworks.com/matlabcentral/answers/uploaded_files/1081490/case_452_14.png';
grayimg = imread(filename);
imshow(grayimg, [])
rgbimg = ind2rgb(grayimg, cmap);
imshow(rgbimg)
  4 个评论
Rishi Raj
Rishi Raj 2022-7-29
ok.. png has to be saved with a different format.. the following code worked..
path=strcat('/Volumes/ESD-USB/_RISHI/TTV_png/Test/mask_visible/',name, '.png');
imwrite(grayImage,cmap, path);

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