Pentax Optio A20 specifications Using Histogram

4 TakingPictures

Using Histogram

				A histogram is a graph showing the
				brightness of an image on the horizontal axis
pixels
				and the number of pixels on the vertical axis
				(distribution chart of the brightness). The
of
				histogram will help you detect the brightness
Number
				of the image you have taken. For instance,
				the graph peak tends to appear on the left
				side for a darker image, and the graph peak
		Brightness		tends to appear on the right side for a brighter
	(Dark)		(Bright) image.
				In general, when the exposure meter of your
				image is well-balanced, the graph peaks
				tend to appear in the middle.

On the contrary, when the exposure meter gets imbalanced tending dark and bright without showing a neutral brightness, the peaks appear not in the middle but on both sides.

Dark Neutral Bright

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