Re: Centering object in workspace.

This assumes you are using one of the more recent versions of the apps-

In Illustrator:
In the ALIGN panel, choose "Align to artboard"
Then click the horizontal and vertical align buttons

In Photoshop:
You will need a layer the same size as the canvas.
Select the layer you need to align, then shift (or command/ctrl)-click the layer the size of the canvas. As long as you have the selection tool selected (the black arrow-shortcut V), you will see alignment options available at the top of the screen. Click the horizontal and vertical alignment buttons.