Putting color on binary image

Hello!

Need a hand here, I want to color my binary image resulting from thresholding of rgb image.

How to do it? let's say, black to blue and white to green.

Answer 1

[Guillaume]

Here's an easy way, assuming that your start image is indeed a binary image (i.e a 2D matrix with values 0 or 1):

%binaryimage: 2D matrix of 0s and 1s
map = [0 0 1;   ...replacement colour for black as a RGB triplet, fully saturated blue in this case
       0 1 0];    %replacement colour for white as a RGB triplet, fully saturated green in this case
colouredimage = map(binaryimage + 1 + cat(3, 0, 2, 4));
imshow(colouredimage);  %to check

edit: Actually an even easier way, and certainly easier to understand, is with

map = [0 0 1;   ...replacement colour for black as a RGB triplet, fully saturated blue in this case
       0 1 0];    %replacement colour for white as a RGB triplet, fully saturated green in this case
colouredimage = label2rgb(binaryimage + 1, map);

assuming you have the image processing toolbox.

[Ravin Rayeok]

Ah i see, thanks a lot!