2D Setup

I want to perform a 2D Orthographic render of a scene. The scene consists of textured planes. Each plane has been sized match the pixel dimensions at which they should be rendered. So a 300x300 plane (Blender World Units) should appear in the render at 300x300 pixels. How do I configure my camera (such as Orthographic Size) to achieve this? What numbers should I use?

Thanks in advance.

Use the Import Images As Planes script, you may have to activate the AddOn user User Preferences\Import-Export. This AddOn will create a UV mapped image plane that is the exact size of the image. Then place your camera above the image in top viewport. Set your render dimensions to the same size as the image. Place the camera in Orthographic mode and adjust the image plane in z-space till t covers the entire camera fov.