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

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Anand 2014-8-28

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评论： Anand 2014-8-29

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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Answer 1

Joseph Cheng 2014-8-28

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编辑：Joseph Cheng 2014-8-28

在 MATLAB Online 中打开

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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Anand 2014-8-28

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...?

Joseph Cheng 2014-8-28

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

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Answer 2

Image Analyst 2014-8-28

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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);