| • | Preview( nZoom ) => finish all processing, and opens the preview window. |
| options are : nZoom : indicates the initial zoom for the preview window, default is 1.00 (100 %) |
| -1 : indicates initial zoom to height of window |
| -2 : indicates initial zoom to width of window |
| -3 : indicates initial zoom to hole window size (proportions may be distorted) |
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