How to create rgb image uint8

I want to create RGB image 100x8 for every color as uint8. I have done what I want but for double format.

image=zeros(100,8,3); %initialize

image(:,1,1)=1; %R

image(:,2,2)=1; %G

image(:,3,3)=1; %B

image(:,4,[2 3])=1; %C

image(:,5,[1 3])=1; %M

image(:,6,[1 2])=1; %Y

image(:,7,:)=0; %K

image(:,8,:)=1; %W

subimage(image);

Answer 1

[Jan]

Using your image array:

imageUINT8 = uint8(image * 255);

Or directly:

imageUINT8   = zeros(100,8,3, 'uint8');
image(:,1,1) = 255;  % Implicit cast to UINT8
...