Quality of image is getting reduced in Play Mode

Hi, I have a problem. In the Scene View the image’s quality is how it should be but in the Play Mode it’s terrible if I reduce the size of the image. The image is 2048x2048 pixels. I did very much research but unfortunately nothing actually helped.

Well, in play mode you’re zoomed in at 6.25x. If you want to see it at a more appropriate resolution, zoom out by using the scroll wheel or dragging the slider at the top of the play mode screen.