===Crear um banner===
To create a banner, first '' 'find''' a suitable image—there are many options on [[:Commons: Main Page|Wikimedia Commons]]. The full size image should be wider than 2100px, since the banner itself will need to be that width. Download the image and open it using GIMP [http://www.gimp.org/] ( or another image editor of your choice). A simple online picture editor can be found at [http://www.pixlr.com/editor Pixlr].
With GIMP, Rotate the image if necessary to get the horizon level, using (Shift+R) or Tools->Transform tools->Rotate. ''' crop''' the image using the crop tool (Shift+C) after setting the crop tool to a fixed aspect ratio of 2100:300 in the " tool options" window. ( If you don't see the tool options window, click Windows -> Dockable Dialogs -> Tool Options.) When you have adjusted the image boundaries to your taste, hit enter to crop the image. Then click Image -> Scale Image and enter 2100 for width and 300 for height, then click '''Scale'''. Lastly, use File -> Export to ''' save''' the cropped image as a jpg.
If you're on Mac OS X, you can use "Preview" to easily crop the images.
====Nomes dos arquivos de banners====