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domingo, 11 de noviembre de 2007

EQUALIZER

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This plugin offers three methods of equalization, with several options to make this process as much as possible exploitable. In fact, what is equalization? Roughly speaking, equalization is a process that generate for each image the "optimal" curve which once applied to that image would improve contrast, in a relevant way. To reach that result, the process exploits intensively the histogram of frequencies.

Here's the three equalization methods, applied to the same image:

Original Image

Levels



  • Here's a brief description of the three methods:

  • Levels: Equalize the three channels R,G,B in an independent way. Can improve dramatically contrast. However this method often introduces important distortions of tints. Reserve it for particular cases.

  • Contrast: Apply the same curve to the three channels. Frequencies of the three channels are totalized here to generate the curve. This method is generally the most satisfying.

  • Luminosity: Preserve hue and saturation. Luminosity is modified, or directly by equalizing this one (option: perceptual), or indirectly by equalizing one of the three channels.

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@>-,´-: MaLiNa