how to make white regions in red color

how to make the white regions in this image to red color

Answer 1

[KSSV]

I = imread('Capturefffffff.png') ;
I(:,:,2:3) = 0 ;
imshow(I)

[kmla]

thank you. and how to get the blue color

[Image Analyst]

I(:,:,1:2) = 0 ;