android图像处理（3）浮雕效果

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
plaincopy

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);

}

}