¡¡Hello everybody!!

I´ve made my first map en cc3 and i want to convert it in a PNG file with a high quality. I can´t do it. I have been triying to do it with the PDF creator and always, when i open de PNG file... is all in white. Like a white paper. I don´t know what to do. If i save it directly from cc3, the quality is bad :S

¡¡Help me please!!

PD: Sorry for my english, maybe it´s not all correct xD