android图像处理(3)浮雕效果

发布时间:2014-10-23 23:26:47
来源:分享查询网

这篇将讲到图片特效处理的浮雕效果。跟前面一样是对像素点进行处理,算法是通用的。 算法原理:用前一个像素点的RGB值分别减去当前像素点的RGB值并加上127作为当前像素点的RGB值。 例: ABC 求B点的浮雕效果如下: B.r = C.r - B.r + 127; B.g = C.g - B.g + 127; B.b = C.b - B.b + 127; 注意RGB值在0~255之间。 效果图:                      原图                                                                              效果图 [java] view plaincopyprint? package com.color;    import android.content.Context;  import android.graphics.Bitmap;  import android.graphics.BitmapFactory;  import android.graphics.Canvas;  import android.graphics.Color;  import android.graphics.Paint;  import android.util.AttributeSet;  import android.widget.ImageView;    public class ColorView extends ImageView {        private Paint myPaint = null;      private Bitmap bitmap = null;      private int width,height;      private int[] oldPixels;        private int[] newPixels;        private int color,color2;      private int pixelsR,pixelsG,pixelsB,pixelsA,pixelsR2,pixelsG2,pixelsB2;            public ColorView(Context context, AttributeSet attrs)      {          super(context, attrs);          bitmap = BitmapFactory.decodeResource(context.getResources(),R.drawable.ww);           width = bitmap.getWidth();            height = bitmap.getHeight();          oldPixels = new int[width*height];           newPixels = new int[width*height];          invalidate();      }      @Override      protected void onDraw(Canvas canvas) {          super.onDraw(canvas);           //获取像素           bitmap.getPixels(oldPixels, 0, width, 0, 0, width, height);                    for(int i = 1;i < height*width; i++){                  color = oldPixels[i-1];                  //前一个像素                   pixelsR = Color.red(color);                  pixelsG = Color.green(color);                  pixelsB = Color.blue(color);                  //当前像素                   color2 = oldPixels[i];                  pixelsR2 = Color.red(color2);                  pixelsG2 = Color.green(color2);                  pixelsB2 = Color.blue(color2);                                    pixelsR = (pixelsR - pixelsR2 + 127);                  pixelsG = (pixelsG - pixelsG2 + 127);                  pixelsB = (pixelsB - pixelsB2 + 127);                  //均小于等于255                   if(pixelsR > 255){                      pixelsR = 255;                  }                                    if(pixelsG > 255){                      pixelsG = 255;                  }                                    if(pixelsB > 255){                      pixelsB = 255;                  }                                    newPixels[i] = Color.argb(pixelsA, pixelsR, pixelsG, pixelsB);                            }          bitmap.setPixels(newPixels, 0, width, 0, 0, width, height);          canvas.drawBitmap(bitmap,0,0,myPaint);      }  }   package com.color; import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.util.AttributeSet; import android.widget.ImageView; public class ColorView extends ImageView { private Paint myPaint = null; private Bitmap bitmap = null; private int width,height; private int[] oldPixels; private int[] newPixels; private int color,color2; private int pixelsR,pixelsG,pixelsB,pixelsA,pixelsR2,pixelsG2,pixelsB2; public ColorView(Context context, AttributeSet attrs) { super(context, attrs); bitmap = BitmapFactory.decodeResource(context.getResources(),R.drawable.ww); width = bitmap.getWidth(); height = bitmap.getHeight(); oldPixels = new int[width*height]; newPixels = new int[width*height]; invalidate(); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); //获取像素 bitmap.getPixels(oldPixels, 0, width, 0, 0, width, height); for(int i = 1;i < height*width; i++){ color = oldPixels[i-1]; //前一个像素 pixelsR = Color.red(color); pixelsG = Color.green(color); pixelsB = Color.blue(color); //当前像素 color2 = oldPixels[i]; pixelsR2 = Color.red(color2); pixelsG2 = Color.green(color2); pixelsB2 = Color.blue(color2); pixelsR = (pixelsR - pixelsR2 + 127); pixelsG = (pixelsG - pixelsG2 + 127); pixelsB = (pixelsB - pixelsB2 + 127); //均小于等于255 if(pixelsR > 255){ pixelsR = 255; } if(pixelsG > 255){ pixelsG = 255; } if(pixelsB > 255){ pixelsB = 255; } newPixels[i] = Color.argb(pixelsA, pixelsR, pixelsG, pixelsB); } bitmap.setPixels(newPixels, 0, width, 0, 0, width, height); canvas.drawBitmap(bitmap,0,0,myPaint); } }

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