Replace the white region in an binary image with Green ? and black colour unaffected

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I Will read my input image as binary.(may be logical or uint8). The output must be Image with green colours in white region and black remains the same.

Accepted Answer

Joseph Cheng
Joseph Cheng on 28 Aug 2014
Edited: Joseph Cheng on 28 Aug 2014
you can define the colormap used. here is a quick example
point3d = imread('pears.png');
value = rgb2gray(point3d);
BIN = value>124;
cmap = [ 0 0 0;0 1 0];
imagesc(BIN),colormap(cmap)
so since i have a binary i know the green area is the logical 1 and black 0. if it is not logical then you'll have to scale the colormap to the values of white and black.
  2 Comments
Anand
Anand on 28 Aug 2014
I accept your answer.. but I need to store that last output ie Image with green color.. I tried using imwrite(BIN,'new.jpg').. but its only writing the previous black and white image.. any help on this...?

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More Answers (1)

Image Analyst
Image Analyst on 28 Aug 2014
Anand, if you want an RGB image instead of a pseudocolored logical image (with values of 0 and 1) then you need to do this:
grayImage = uint8(255 * BIN); % BIN is from Joseph's code.
blackImage = zeros(size(grayImage), 'uint8');
rgbImage = cat(3, blackImage , grayImage, blackImage); % Only green channel is non-zero.
imshow(rgbImage);
imwrite(rgbImage, fullFileName);

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