Ask Proxima Impression 860 manual Freq, Tune, Scale

USER GUIDE		LCD PROJECTOR
		OPERATION
	FREQ	∙ With data from a source displayed on-screen, set the
		background to a chequered pattern 50% grey (direct
		mode 1:1 uncompressed).
		∙ If the frequency is set wrongly, vertical unstable
		bands will be visible in the image (see illustration).
		∙ Adjust with the frequency right/left keys to remove all
		the vertical bands (see illustration).

TUNE	∙ Adjust the tuning up/down keys to stabilize the
	image. Preferably all the “sideways swimming”lines
	should be removed (see illustration).

SCALE	∙ If your computer screen resolution is not exactly
	800x600, select SCALE. This will scale the source
	resolution to fit the LCD screen resolution by
	adjusting the number of vertical and horizontal pixel
	lines at intervals throughout the image.

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