At present (170426), although EasyEDA allows the export of a layer as `Black on White Background`, it does not support the export of a PCB copper layer as a negative (i.e. White on Black Background). * This tip describes a workaround. First, install a copy of the FOSS gerbv from: https://sourceforge.net/projects/gerbv/files/gerbv/ * If you are running Linux then it is easiest to install gerbv from your distribution's repository. 1. Download and then unzip your Gerber file; 2. In gerbv, open the layer you want to negate (File > Open Layer(s)); 3. Either press `F6` or, in the left hand panel, right-click on the selected layer and click on `Change color`; 4. Set the colour to `#FFFFFF` (white); 5. In the left hand panel, right-click on the selected layer and click on `Invert color`; 6. Then **EITHER** `File > Print` (CTRL+P); 7. **OR** `File > Export`, select the output file format then select where to save the file and enter the desired file name **including** the relevant suffix such as .png or .pdf.