Author:	Camillo Bosco (camillo.bosco@studenti.unict.it)
Advisor:	Prof. Sebastiano Battiato (battiato@dmi.unict.it)
History:	This plugin was implemented in July 2005
Works with:	8-bit images (grayscale and indexed) and RGB images
ImageJ's version:	1.33u (used to develop this plugin)
Source:	Power_Law.java
Installation:	Download Power_Law.java to the plugins folder and compile it with the "Compile and Run" command. Restart ImageJ to add the "Power Law" command to the Plugins menu.
Description:	This plugin implements the exponential transform operator for image enhancement in the spatial domain. It is defined as follows: s=c*(r^gamma) where c and gamma are positive constants, r is the value of the input pixel and s is the corresponding value of the output pixel. Changing the gamma parameter's value user can control the effects of this operator: if gamma is less than 1 this transformation is similar to the logarithm operator; if gamma is equal to 1 it is possible to obtain the identity transformation; if gamma is greater than 1 the transformation curves have exactly the opposite effect as those generated with values of gamma less than 1;     Therefore this operator allows to define a family of possible transformation curves. By varying the constant c other different transformation curves can be found.
Usage:	Here is a brief description: 1) Choose your preferred float values for gamma (with 0 < gamma <=25) and c (scale factor) with c!=0 and c > 0; 2) Click on the button "Draw" to draw the graph for the chosen parameters values; 3) If you want, click on the button "List" to view the LUT values; 4) Also the possibility to save the graph in GIF format is provided by clicking on the button "Save"; 5) Click on the button "Preview" to view as the image would be if it was processed according to the chosen transform curve; 6) Click on the button "Apply" to definitively apply the current transform to the image; 7) Click on the button "Help & Info" to view some information about this plugin; You can also draw the chosen curve using the slider which allows to select the gamma value.
Downloads:	Bosco C., A presentation of this project provided by C.Bosco (in Italian);
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