How to color a binary image?

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Sabarinathan Vadivelu
Suppose a binary image is considered, which consists of two colors. Is it possible to assign red color to the white portions in the image?
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Jan
Jan 2012-10-2
编辑：Jan 2012-10-2
Yes.
A binary image consiste of two colors, 0 and 1. Which of them do you call "red" and where does the color information come from?
Sabarinathan Vadivelu
Sabarinathan Vadivelu 2012-10-2
Pixels with 1 should be coloured as red. Is it possible?

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Jan
Jan 2012-10-2
编辑：Jan 2012-10-2
bin = rand(320, 200) > 0.5; % Binary test image
R = 1; % Value in range [0, 1]
G = 1;
B = 1;
RGB = cat(3, bin * R, bin * G, bin * B);
Now the pixels which have the value 1 in the bin image have the value [R,G,B] in the RGB image, while the other pixels are black.
Alternatively:
CMap = [0.5, 0.2, 0.9; 0.1, 0.8, 0.3];
RGB = ind2rgb(bin + 1, CMap)
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Sabarinathan Vadivelu
Sabarinathan Vadivelu 2012-10-2
figure,set(gca,'Color','r'),imshow(outImage);
Where outImage is a binary Image. Is this true?
Jan
Jan 2012-10-2
编辑：Jan 2012-10-2
To get red for pixels of color 1 (you still do not specify what the 0 pixels should look like...):
  • Either set B=0 and G=0 in my 1st example
  • Or use the colormap CMap=[0,0,0; 1,0,0] in the 2nd example.

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