images imported to be used for GUI are bigger and pixalated

Hello Guys,

I am trying to import an image (sprite atlas) after making it in Texture Packer and then importing it, this causes the image to be pixalated a bit and all the individual images are slightly bigger.

when i try to import the individual image on their own directly, they are no longer pixalated, but they are still a bit bigger, for example one of the images is 960 x 200, and i have set resolution of my game to be 960 x 1280 but still the imported image doesnt fit into when placed as UI -> Image and is bigger.

Can anyone tell me why both things are happening?

Thanks