Atlas memory [closed]

I am not sure how atlas memory works. I have an atlas that stores only 1 image which is a background of size 1920x1280 at 4x. The thing that I don't understand is that the image in the ressource folder has a size of 435kb but the atlas uses 2.3mb. Why is that?

Because atlases are about managing game resources in device memory, it's the memory that's important when reporting numbers, not the space required for storage. When an image is loaded to be displayed on your device, it's uncompressed, so it costs a lot more in device memory than it does in storage.

The numbers should be reported as 4 bytes (for rgba) * image width * image height.

Oh, right thanks.