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Hand Painting Backgrounds for use in 2d Animation Programs?

Hand Painting Backgrounds for use in 2d Animation Programs?

I want to create hand painted backgrounds for 16x9 (HDTV). I did searches for field guides, drawing papers and a lot more and I could not find the information. I did find that the pixels are 1920 x 1080 (or 1280x720 OR 1440x1080 non-squared)

Anyways, using the 1920x1080 pixels I understand from searching the web that that is a ratio of1.78:1. But I went into a graphics program and created a file at 1920x1080 pixels (res set at 72 dpi) and got an image size of 26.667 inches x 15 inches. I re-did the image of 1920x1080 pixels to a 300dpi and got and image size of 6.4 inches x 3.6 inches. Which I don’t think either is a 1.78:1 ratio,

So what are some paper sizes that conforms to the 16x9 (or do I use the 1.78:1 ratio), either way I would like to know what some of the paper sizes would be.