kolourpaint/imagelib/effects/kpEffectToneEnhance.h

   1
   2 /*
   3    Copyright (c) 2003-2007 Clarence Dang <dang@kde.org>
   4    Copyright (c) 2006 Mike Gashler <gashlerm@yahoo.com>
   5    All rights reserved.
   6
   7    Redistribution and use in source and binary forms, with or without
   8    modification, are permitted provided that the following conditions
   9    are met:
  10
  11    1. Redistributions of source code must retain the above copyright
  12       notice, this list of conditions and the following disclaimer.
  13    2. Redistributions in binary form must reproduce the above copyright
  14       notice, this list of conditions and the following disclaimer in the
  15       documentation and/or other materials provided with the distribution.
  16
  17    THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18    IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19    OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20    IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22    NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26    THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27 */
  28
  29
  30 #ifndef kpEffectToneEnhance_H
  31 #define kpEffectToneEnhance_H
  32
  33
  34 #include <kpImage.h>
  35
  36
  37 //
  38 // Histogram Equalizer effect.
  39 //
  40 // It just divides out the color histogram from the pixel values. (So if
  41 // you plot the color histogram after equalizing, you should get a nearly
  42 // flat/uniform distribution.)
  43 //
  44 // The two sliders adjust:
  45 //
  46 // 1. The extent to which it equalizes
  47 // 2. The local-ness of the equalization. (In other words, it computes just
  48 //    the histogram of the regions near the pixel it is adjusting.)
  49 //
  50 // ASSUMPTION: The given <image> is not paletted (currently, this is the
  51 //             same as the screen mode not being paletted).
  52 //
  53 class kpEffectToneEnhance
  54 {
  55 public:
  56     static kpImage applyEffect (const kpImage &image,
  57         double granularity, double amount);
  58 };
  59
  60
  61 #endif  // kpEffectToneEnhance_H