Android改变图像的饱和度 亮度和对比度

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转自：http://blog.youkuaiyun.com/sxwyf248/article/details/7019731

运行结果：

使用到了ColorMatrix。

Java代码：

[java]  view plain copy

1. package com.figo.imgedit;  
2.   
3. import java.io.FileNotFoundException;  
4.   
5. import android.app.Activity;  
6. import android.graphics.Bitmap;  
7. import android.graphics.Bitmap.Config;  
8. import android.graphics.BitmapFactory;  
9. import android.graphics.Canvas;  
10. import android.graphics.ColorMatrix;  
11. import android.graphics.ColorMatrixColorFilter;  
12. import android.graphics.Paint;  
13. import android.net.Uri;  
14. import android.os.Bundle;  
15. import android.util.Log;  
16. import android.widget.ImageView;  
17. import android.widget.SeekBar;  
18. import android.widget.SeekBar.OnSeekBarChangeListener;  
19.   
20. public class ImgeditActivity extends Activity {  
21.     /** Called when the activity is first created. */  
22.     private Bitmap srcBitmap, dstBitmap;  
23.     private String pathName = "/sdcard/testimg.jpg";  
24.   
25.     private ImageView dstimage = null;  
26.     private SeekBar SaturationseekBar = null;  
27.     private SeekBar BrightnessseekBar = null;  
28.     private SeekBar ContrastseekBar = null;  
29.     private int imgHeight, imgWidth;  
30.   
31.     public static final int PICTURE = 0;  
32.     public static final int MAX_WIDTH = 240;  
33.     public static final int MAX_HEIGHT = 240;  
34.     private Uri imageUri;  
35.   
36.     @Override  
37.     public void onCreate(Bundle savedInstanceState) {  
38.         super.onCreate(savedInstanceState);  
39.         setContentView(R.layout.main);  
40.   
41.         dstimage = (ImageView) findViewById(R.id.dstImageView);  
42.         SaturationseekBar = (SeekBar) findViewById(R.id.Saturationseekbar);  
43.         BrightnessseekBar = (SeekBar) findViewById(R.id.Brightnessseekbar);  
44.         ContrastseekBar = (SeekBar) findViewById(R.id.Contrastseekbar);  
45.   
46.         srcBitmap = BitmapFactory.decodeFile(pathName);  
47.         dstimage.setImageBitmap(srcBitmap);  
48.         imgHeight = srcBitmap.getHeight();  
49.         imgWidth = srcBitmap.getWidth();  
50.   
51.         dstBitmap = Bitmap.createBitmap(imgWidth, imgHeight, Config.ARGB_8888);  
52.   
53.         SaturationseekBar  
54.                 .setOnSeekBarChangeListener(new OnSeekBarChangeListener() {  
55.                     // 当拖动条的滑块位置发生改变时触发该方法  
56.                     public void onProgressChanged(SeekBar arg0, int progress,  
57.                             boolean fromUser) {  
58.                         // 创建一个相同尺寸的可变的位图区,用于绘制调色后的图片  
59.                         Bitmap bmp = Bitmap.createBitmap(imgWidth, imgHeight,  
60.                                 Config.ARGB_8888);  
61.                         ColorMatrix cMatrix = new ColorMatrix();  
62.                         // 设置饱和度  
63.                         cMatrix.setSaturation((float) (progress / 100.0));  
64.   
65.                         Paint paint = new Paint();  
66.                         paint.setColorFilter(new ColorMatrixColorFilter(cMatrix));  
67.   
68.                         Canvas canvas = new Canvas(bmp);  
69.                         // 在Canvas上绘制一个已经存在的Bitmap。这样，dstBitmap就和srcBitmap一摸一样了  
70.                         canvas.drawBitmap(srcBitmap, 0, 0, paint);  
71.   
72.                         dstimage.setImageBitmap(bmp);  
73.   
74.                     }  
75.   
76.                     public void onStartTrackingTouch(SeekBar bar) {  
77.                     }  
78.   
79.                     public void onStopTrackingTouch(SeekBar bar) {  
80.                     }  
81.                 });  
82.   
83.         BrightnessseekBar  
84.                 .setOnSeekBarChangeListener(new OnSeekBarChangeListener() {  
85.                     // 当拖动条的滑块位置发生改变时触发该方法  
86.                     public void onProgressChanged(SeekBar arg0, int progress,  
87.                             boolean fromUser) {  
88.                         Bitmap bmp = Bitmap.createBitmap(imgWidth, imgHeight,  
89.                                 Config.ARGB_8888);  
90.                         int brightness = progress - 127;  
91.                         ColorMatrix cMatrix = new ColorMatrix();  
92.                         cMatrix.set(new float[] { 1, 0, 0, 0, brightness, 0, 1,  
93.                                 0, 0, brightness,// 改变亮度  
94.                                 0, 0, 1, 0, brightness, 0, 0, 0, 1, 0 });  
95.   
96.                         Paint paint = new Paint();  
97.                         paint.setColorFilter(new ColorMatrixColorFilter(cMatrix));  
98.   
99.                         Canvas canvas = new Canvas(bmp);  
100.                         // 在Canvas上绘制一个已经存在的Bitmap。这样，dstBitmap就和srcBitmap一摸一样了  
101.                         canvas.drawBitmap(srcBitmap, 0, 0, paint);  
102.                         dstimage.setImageBitmap(bmp);  
103.   
104.                     }  
105.   
106.                     public void onStartTrackingTouch(SeekBar bar) {  
107.                     }  
108.   
109.                     public void onStopTrackingTouch(SeekBar bar) {  
110.                     }  
111.                 });  
112.   
113.         ContrastseekBar  
114.                 .setOnSeekBarChangeListener(new OnSeekBarChangeListener() {  
115.                     // 当拖动条的滑块位置发生改变时触发该方法  
116.                     public void onProgressChanged(SeekBar arg0, int progress,  
117.                             boolean fromUser) {  
118.                         Bitmap bmp = Bitmap.createBitmap(imgWidth, imgHeight,  
119.                                 Config.ARGB_8888);  
120.                         // int brightness = progress - 127;  
121.                         float contrast = (float) ((progress +