Image is too large to work in GS?

WhySoCREATIVE

I get a message when inserting a 640x3344 background image which I want to use it for a parallax background.
Does anyone know what the largest size I can use is?

quantumsheep

I think it's 2048x2048

QS

Socks

@quantumsheep said:
I think it's 2048x2048

QS

I've converted to standard Flappy-Bird Units, pixels are so 2014 (early 2014).

The largest size image you can import is 1 x 1.33 FBu.

WhySoCREATIVE

Hmmm I have to find a better way for parallax background as the bottom layer is really long