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I'm sorry I accidentally marked this question as answered: http://forum.processing.org/two/discussion/2573/fullscreen-background-color#Item_3 This is a summary of what I've done so far.
So I'm exporting my sketch to an executable (Processing 2.1 on Windows 7). When I export to full screen mode the background colour is grey even though I've set it to white in my sketch.
But I've tried both
frame.setBackground(new java.awt.Color(255, 255, 255));
And change run.present.bgcolor=#666666 in my preferences.txt to #ffffff. The latter keeps reverting back to the default #666666.
I hope someone has another suggestion, my deadline is tomorrow. So any help is greatly appreciated. TIA, danielle.