Decreasing 27" iMac resolution 2560x1440 into 1280x720

Hi, I was about to change my native 27" resolution (2560x1440px) to just a half (1280x720px). I expected sharp result - just double size pixels without any smoothing. but I got only a terribly blured picture of all graphics on the screen - windows, buttons, my illustrator graphics I'm working on right now... Is there any way how to turn this clever smoothing function off? I need to temporarily decrease the resolution because my tablet is too small for such huge resolution. thank you, tom

Yeah, I know. these two options are about FONT smoothing. I've got problem with all around antialiasing. you have iMac too, Barbara, could you please try to decrease resolution of your screen to just half of it? Is it antialiased? I'll try to upload some pictures in here, thanks.

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