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图像处理之老照片特效

关键词:Java图像处理之老照片特效  阅读(737) 赞(16)

[摘要]本文主要是对图像处理之老照片特效的讲解,希望对大家学习图像处理之老照片特效有所帮助。

  PS中有一种滤镜可以让图像看上去好像历经岁月,微微泛黄

  英文中这种图像特效被称为Sepia Tone Effect 直译过来的意思

  就是黄褐色特效。它的基本处理算法如下:

  1. 首先对图像重新计算RGB值,计算公式如下:

  [java]

  nt fr= (int)(((double)tr * 0.393) + ((double)tg * 0.769) + ((double)tb * 0.189));

  int fg = (int)(((double)tr * 0.349) + ((double)tg * 0.686) + ((double)tb * 0.168));

  int fb= (int)(((double)tr * 0.272) + ((double)tg * 0.534) + ((double)tb * 0.131));

  int fr= (int)(((double)tr * 0.393) + ((double)tg * 0.769) + ((double)tb * 0.189));

  int fg = (int)(((double)tr * 0.349) + ((double)tg * 0.686) + ((double)tb * 0.168));

  int fb= (int)(((double)tr * 0.272) + ((double)tg * 0.534) + ((double)tb * 0.131));2. 对图像计算出来的新的RGB值根据随机权重与旧值混合。

  计算随机权重的代码如下:

  [java]

  private double noise() {

  return Math.random()*0.5 + 0.5;

  }

  private double noise() {

  return Math.random()*0.5 + 0.5;

  }混合颜色的代码如下:

  [java]

  private double colorBlend(double scale, double dest, double src) {

  return (scale * dest + (1.0 - scale) * src);

  }

  private double colorBlend(double scale, double dest, double src) {

  return (scale * dest + (1.0 - scale) * src);

  }

  滤镜完全源代码:

  [java]package com.gloomyfish.filter.study;

  import java.awt.image.BufferedImage;

  public class SepiaToneFilter extends AbstractBufferedImageOp {

  @Override

  public BufferedImage filter(BufferedImage src, BufferedImage dest) {

  int width = src.getWidth();

  int height = src.getHeight();

  if ( dest == null )

  dest = createCompatibleDestImage( src, null );

  int[] inPixels = new int[width*height];

  int[] outPixels = new int[width*height];

  getRGB( src, 0, 0, width, height, inPixels );

  int index = 0;

  for(int row=0; row<height; row++) {

  int ta = 0, tr = 0, tg = 0, tb = 0;

  for(int col=0; col<width; col++) {

  index = row * width + col;

  ta = (inPixels[index] >> 24) & 0xff;

  tr = (inPixels[index] >> 16) & 0xff;

  tg = (inPixels[index] >> 8) & 0xff;

  tb = inPixels[index] & 0xff;

  //int fr= (int)(((double)tr * 0.393) + ((double)tg * 0.769) + ((double)tb * 0.189));

  //int fg = (int)(((double)tr * 0.349) + ((double)tg * 0.686) + ((double)tb * 0.168));

  //int fb= (int)(((double)tr * 0.272) + ((double)tg * 0.534) + ((double)tb * 0.131));

  int fr = (int)colorBlend(noise(), (tr * 0.393) + (tg * 0.769) + (tb * 0.189), tr);

  int fg = (int)colorBlend(noise(), (tr * 0.349) + (tg * 0.686) + (tb * 0.168), tg);

  int fb = (int)colorBlend(noise(), (tr * 0.272) + (tg * 0.534) + (tb * 0.131), tb);

  outPixels[index] = (ta << 24) | (clamp(fr) << 16) | (clamp(fg) << 8) | clamp(fb);

  }

  }

  setRGB( dest, 0, 0, width, height, outPixels );

  return dest;

  }

  private double noise() {

  return Math.random()*0.5 + 0.5;

  }

  private double colorBlend(double scale, double dest, double src) {

  return (scale * dest + (1.0 - scale) * src);

  }

  public static int clamp(int c)

  {

  return c > 255 ? 255 :( (c < 0) ? 0: c);

  }

  public String toString()

  {

  return "Sepia Tone Effect - Effect from Photoshop App";

  }

  }



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