How to create empty XYZ image matrix

I am trying to do colour correction and I need an empty image in the XYZ colourspace to write values into. Is there a way to create a blank XYZ image to store the values?

[Stephen23]

im = nan(r,c,3)

Answer 1

[Constantino Carlos Reyes-Aldasoro]

In addition to the above, you can also consider zeros

emptyMatrix = zeros(x,y,z);

And then you can add values into that matrix, or create one matrix for every channel that you want to use:

x_channel  = zeros(rows,columns);
y_channel  = zeros(rows,columns);
z_channel  = zeros(rows,columns);

And if needed you can concatenate the matrices afterwards.