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if you want it as a texture on geometry plane, you need to set your plane scale top match the texture aspect ratio, like if you have an image with aspect ratio of 16:9, you need to scale your plane so it matches 16:9, and if you need it to run faster and still can display it on you monitor you can scale the image using photoshop and make sure that "constrain proportion" is checked, so you can scale it in your case to 2560x1321....
hope that helps
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