Comelit PPTZ120IRE Manuel Utilisateur page 54

8. Image processing does not work properly.
Possible Reason 1: System issue, DirectX function is disabled, causing slow displaying of images and abnormal colour.
Possible Reason 2: Hardware issue, graphics card does not support image acceleration and hardware zooming functions (for
hardware issues, the only solution is to replace the graphics card).
Solution: Install DirectX image drive, then StartRunenter "Dxdiag" command.
Rev. A
Enable DirectDraw speedup, Direct3D speedup, AGP veins speedup in DirectX function. If they
cannot be enabled, that means DirectX installation has failed or the hardware does not support
it.