Why do images still display pixels after calibration?

The toolbar magnification setting does not apply to images; it only applies to video. You can check and change the magnification by clicking the resolution button in the image menu (Figure 1).

Then the resolution setting dialog will pop up (Figure 2), where you can change calibration information. If the resolution value is 0, it means the image has no calibration information.

You can specify the magnification in the magnification dropdown. If the resolution value is not 0 and you still see objects in pixel units, please check the selected unit setting in the toolbar.

Figure 1

Figure 2