Written to the picture header as the view type. A non-fisheye view skips the validity check, because evalglare requires an angular fisheye view.

Compared against the illuminance evalglare derives from the finished image. Under 10% error is expected; over 25% the tutorial recommends rejecting the image. With a non-fisheye projection the value is recorded in the header but not compared, because evalglare requires an angular fisheye view.