Question about matrixcolor

Question

   

Hi have this part of the code to convert an image to gray color.

Dim c As New ColorMatrix(New Single()() {New Single() {0.3F, 0.3F, 0.3F, 0, 0},                              
   New Single() {0.59F, 0.59F, 0.59F, 0, 0},                               
  New Single() {0.11F, 0.11F, 0.11F, 0, 0},                                
 New Single() {0, 0, 0, 1, 0},                                 
New Single() {0, 0, 0, 0, 1}})

But this code was not  made by me. 

I wonder how and what is possible to know the values ​​of the matrix to convert to other scales. ie if instead of wanting to convert to gray color you want for a red color which are the values​​? where do I get?

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