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You need to keep things separate here.
Photoshop doesn't work with physical sizes, it only works with pixels. The physical size is determined by whatever ppi value you assign to the finished work - or vice versa. Ppi is a measurement of pixel density on the printing medium. Pixels per inch. It's a very simple formula, and it means exactly what it says.
You don't need to do the math, the Photoshop Image Size dialog will do it for you. Put in two values, and it will tell you the third. Just r
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You need to keep things separate here.
Photoshop doesn't work with physical sizes, it only works with pixels. The physical size is determined by whatever ppi value you assign to the finished work - or vice versa. Ppi is a measurement of pixel density on the printing medium. Pixels per inch. It's a very simple formula, and it means exactly what it says.
You don't need to do the math, the Photoshop Image Size dialog will do it for you. Put in two values, and it will tell you the third. Just remember to uncheck "resample" (important!).
Forget about scaling. It's just confusing matters here. You can't "upscale" pixels. You need to have enough pixels to begin with. But most likely you don't need nearly as much as you think.
What is the distance up to this ceiling? The farther away, the lower the ppi needed. My guess is that you could probably do this at 10-20 ppi and it will look perfectly sharp - but that depends on the distance.
That said, this will be a huge file and you will need a high-spec computer to handle it.
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