MATLAB: How can an color image can be changed have only four color in desire area.

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Hello , i am doing with image segmentation and have an gray image segmented with only four different intensity level .Now how can be it convert to four different color rgb format.

Best Answer

[indimg, map] = rgb2ind(YourImage, 4);
newimg = ind2rgb(indimg, map);

Related Solutions

MATLAB: Gray image to rgb using ind2rgb

You cannot convert grayscale images back to rgb without loss of information. Many different combinations of RGB values convert to the same grayscale level, so if all you have at a location is the grayscale level, then you cannot know which of the 65536 RGB values that map to the exact same grayscale that the RGB came from.

You can convert RGB to pseudocolor (ind). You could save a copy of the map used for that. You could convert each member of the pseudocolor map into grayscale and display it that way, and later you could convert back the pseudocolor map into RGB. However, if you want to do anything that modifies the grayscale (such as adaptive equalization) then you will have trouble.

[indimg, indmap] = rgb2ind(YourImage);
indasgray = rgb2gray(reshape(indmap,[size(indmap,1),1,3]));
image(indimg);
colromap(indasgray);   %image painted gray but multiple ind might have same gray
ReconstructedImage = ind2rgb(indimg, indmap);   %not indasgray

MATLAB: Convert gray image back to rgb

If you have a color map - a mapping of what intensity should go to what color, like what imread() or rgb2ind() can give you - then you can use ind2rgb.

rgbImage = ind2rgb(grayImage, colormap);

Otherwise use

rgbImage = cat(3, grayImage, grayImage, grayImage);

grayImage needs to be in the range 0-255 uint8 if you want to display it.

Best Answer

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MATLAB: Gray image to rgb using ind2rgb

MATLAB: Convert gray image back to rgb

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