ReadonlycropReadonlyflipMirror the oriented image left-right / top-bottom.
ReadonlyflipOptional ReadonlyperspectiveFour points (top-left, top-right, bottom-right, bottom-left), normalised to the oriented image, that become the corners of the frame: keystone / perspective correction.
ReadonlyrotateQuarter turns, clockwise. Applied first, with the flips: together they are the orientation.
ReadonlystraightenDegrees in [-45, 45]; positive turns the content clockwise about the centre.
The kept rectangle, normalised to the oriented frame.