This method adjusts contrast without changing the brightness range of the image. If the brightness values of the image were represented in a histogram, the Equalize method would have the effect of redistributing the brightness values within the image's brightness range, so that "clumps" of brightness values are spread out more evenly.

For example, if an image has many pixels that have similar brightness, the Equalize method will introduce greater difference in brightness between these pixels, without changing the least bright or most bright pixels.

The effect is that greater detail can be seen in areas that previously had very similar brightness.

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