Click on File then New in your tool bar, New Image, 475 pixels by 475 pixels 100 dpi for the web, 4.75 inches in whatever dpi you prefer works for personal use.
File, New, Open a new image 950 pixels by 475 pixels (9.5 inchesx4.75 inches)
You will get a pop up window like this one, choose left 0,right 475, top 0, bottom 475 and click okay.
Save it as a jpg. Click the example below to see the full sized version.
When you print it, make sure your printer settings are set to landscape/100%
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