Planar PD7170 operation manual Letterbox

Operation

Table 4-2. Aspect Ratio Settings (continued)

Aspect		Aspect	Geometry of Projected Image
		Ratio of
Ratio	Description		With Standard Lens
		Source		With Anamorphic Lens (2.35:1 Screen)
Setting
		Signal	(1.78:1 Screen)

16:9

	Letterbox mode scales
	(zooms in on) a 4:3
	image linearly (by the
Letterbox	same amount on all
	sides) to fill a 16:9
	display, cropping the
	top and bottom of the
	image.

4:3

16:9

	4:3 Narrow linearly
	scales the source
4:3	active image
	horizontally, so that a
Narrow	4:3 source has the
	correct aspect ratio
	when using an
	anamorphic lens.

4:3

Planar PD7170 Installation/Operation Manual 41