i wanted to display binary image in blue color....

i wanted to display binary image in blue color... the code i worked with is...

global image
I= im2bw(image);
axes(handles.axes4);
imshow(I)
colormap([0 0 1; 1 1 1])
axis equal;axis off;

the pblm i'm facing is.. when i execute this code it is coming corectly, but it is altering the other images in axes1,2,3 also to blue color.... i want only axes4 image to be displayed in blue color....

why is it coming like that....what shud i do???please reply....

[EDITED, code formatted, Jan]

[Walter Roberson]

duplicates http://www.mathworks.co.uk/matlabcentral/answers/52355-i-wanted-to-display-binary-image-in-blue-color

Answer 1

[Image Analyst]

blankImage = zeros(size(binaryImage));
rgbImage = cat(3, blankImage , blankImage , binaryImage);

DON'T use image as the name of your variable because it's a built-in function name!!!

[Elysi Cochin]

thanks sir... its working...the image is being displayed in a blue background.... but i wanted the image to be displayed in blue...suppose i binarize a barcode image... i want the black lines of barcode to be displayed in blue in a white background...

[Jan]

@Elysi: Do you mean something like this:

blankImage = ones(size(binaryImage));
rgbImage   = cat(3, blankImage, blankImage, not(binaryImage))

"display image in blue" is not a really helpful descritpion of what you want. Image Analyst's answer contains the required techniques, so please feel free to experiment with them until you can solve your problem.

[Elysi Cochin]

thanks sir... the image is being displayed in black background... can the background color be changed to white sir??please reply sir..

[Image Analyst]

Is this what you want:

% Assume binary image is false where the bars are black.
% Extract the individual red, green, and blue color channels.
redChannel = originalRGBImage(:, :, 1);
greenChannel = originalRGBImage(:, :, 2);
blueChannel = originalRGBImage(:, :, 3);
% Make it blue where the bars are.
redChannel  (~binaryImage) = uint8(0);
greenChannel(~binaryImage) = uint8(0);
blueChannel (~binaryImage) = uint8(255);
% Combine individual masked channels into a new RGB image.
rgbImage = cat(3, redChannel, greenChannel, blueChannel);

[Elysi Cochin]

thank u so much sir....