Image reading and processing

How do I generate just the red channel, from the colourful image that I have attached below?

[Jon]

Sorry I don't see your image. Did you attach it? Also it would be good if you could please provide the actual data that you are plotting not just the image

[Usha Silwal]

This is the image I am working on and I just need to display the blue channel of the image.

[Jon]

How is the image encoded? Please provide the matrix you are plotting

Answer 1

[Sourav Bairagya]

After reading the image properly, you can separate the channels using this code segment.

a=imread('test.jpg');
 
a_red=a(:,:,1);       %RED channel
a_green=a(:,:,2);     %GREEN channel
a_blue=a(:,:,3);      %BLUE channel
 
figure;imshow(a);title('Color Image');
figure;imshow(a_red);title('Red Channel');
figure;imshow(a_green);title('Green Channel');
figure;imshow(a_blue);title('Blue Channel');

Now, you can also save each channel as separate image using ‘imwrite’ function. Hope this will help.