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

Asked by Anand
on 28 Aug 2014
Latest activity Commented on by Anand
on 29 Aug 2014
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.

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2 Answers

Answer by Joseph Cheng
on 28 Aug 2014
Edited by Joseph Cheng
on 28 Aug 2014
 Accepted Answer

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.

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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...?
Ah then you'll have to go with Image Analyst's answer.

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Answer by 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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