How to change the WAS minimum pool size to Zero.
On the WRKSHRPOOL display, type *NOSTG into the Defined Size field for the system shared pool that you want to set to zero. However, I suspect that that’s not what you want to do.
For the Problem with the Image acces.
What “problem” is that? Please describe the problem you are having, and also describe why you believe that setting a memory pool to zero is a way to handle the problem.