ViewCast 450E, 240E manual Horizontal Format, Square Pixels, CCIR-601

	Osprey 240e/450e User Guide
Source Width	The Source Width control can be used to trim the black left and right
	edges of an image.
Reference Size for	This part of the dialog box displays the results of more fundamental
Crop and Logo	settings made elsewhere in the dialog box.
Placement
525-Line (NTSC)	This control is for NTSC users. It has no effect for PAL and SECAM
Vertical Format	625-line video standards.
OK	Click OK to accept the settings.
Cancel	Click Cancel to reject the settings and close the window.
Apply	Click Apply to apply the settings.
Help	Click Help to access the user guide.

Horizontal Format

Figure 26. Horizontal Format

The Horizontal Format has the following controls.

Square Pixels	Use the Square Pixels setting for normal 4:3 video (Figure 26) that is viewed
	via a computer monitor. This setting results in a square aspect ratio sampling
	of the source video and a source image of 640 x 480 for 525-line standards and
	768 x 576 for 625-line standards.
CCIR-601	Use the CCIR-601setting for 4:3 video that is viewed on a dedicated video
	monitor. This setting results in a CCIR-601 aspect ratio sampling of the source
	video. It results in a video input horizontal size of 720 pixels for both 525-line
	and 625-line standards. This sizing is standard for dedicated monitors but the
	resulting video appears horizontally stretched (525-line) or squeezed (625-line)
	on a computer monitor.
	It is more efficient to set the horizontal mode to match the size of the output.
	For example, if your target video size is 640 x 480, using Square Pixel sizing in
	PostProcessing Mode will avoid an unnecessary software scaling step in the
	driver.
	On some systems, for reasons external to this driver, 640 x 480 video renders
	on screen a lot faster than 720 x 480 video – that is, the speed difference is a
	lot more than the 9:8 ratio of numbers of pixels.

ViewCast 27