making negative of orcad layout

negative ใน orcad

hi
i am facing the probem of making a pcb on prototype machine
i need the negative of my layout files

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how to make these files negative

From within Layout, choose the Post Processing toolbar button. From the menu that displays, choose Setup Batch and enable Extended Gerber output for your layers. If you are hand-drilling the board, select the Keep Drill Holes Open option to leave an opening in the center of your pads as a drill target. Run batch post processing (choose the Post Processing toolbar button and then choose Run Batch) to create your extended Gerber files and your GerbTool .GTD design file.
From within GerbTool, open your .GTD design file. Double-click on the rectangular Draw Color block and set it to white. Then, double-click on the rectangular Flash Color block and set it to white as well. From the File menu, choose Page Setup and select the Print Background and Color/Gray Scale options. Make sure the Overlay and Sketch options are not enabled. Finally, print the layer by choosing Print from the File menu.

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