canvas size won't change correctly

So I'm trying to take a snapshot of part of the canvas, and then download it. I actually want it to download to the gallery on the phone/ipad when you use it as an app later, but I can't even get the snapshot to look right, so first I need help to solve this weird thing.

I have used this code:

But the image that downloads always get the dimensions 1920x911px no matter what I do! So strange. I don't have any other code that tells the canvas to change it's size or anything, so I don't understand why it does that. I can't upload the capx here because it's a big project and kind of secret. And when I made a new project and try this with dummy images, it works!

Just thought that maybe someone has an idea on why it does this strange thing?

Thanks!

Forgot to say that the actual size of the object "snapshotarea" is 1140x1440px

Ok, I changed the scaling from Scale inner to letterbox scale, and then it works.. But as I understand it, it's scale inner I should use so that it works will all different screen sizes later when I export it? Hm..