Android改變圖像的飽和度、亮度和對比度

使用到了ColorMatrix。

Java代碼：

1. package com.figo.imgedit;
3. import java.io.FileNotFoundException;
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;
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";
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;
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;
36. @Override
37. public void onCreate(Bundle savedInstanceState) {
38. super.onCreate(savedInstanceState);
39. setContentView(R.layout.main);
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);
46. srcBitmap = BitmapFactory.decodeFile(pathName);
47. dstimage.setImageBitmap(srcBitmap);
48. imgHeight = srcBitmap.getHeight();
49. imgWidth = srcBitmap.getWidth();
51. dstBitmap = Bitmap.createBitmap(imgWidth, imgHeight, Config.ARGB_8888);
53. SaturationseekBar
54. .setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
55. // 當拖動條的滑塊位置發生改變時觸發該方法
56. public void onProgressChanged(SeekBar arg0, int progress,
57. boolean fromUser) {
58. // 創建一個相同尺寸的可變的位圖區,用於繪制調色後的圖片
59. Bitmap bmp = Bitmap.createBitmap(imgWidth, imgHeight,
60. Config.ARGB_8888);
61. ColorMatrix cMatrix = new ColorMatrix();
62. // 設置飽和度
63. cMatrix.setSaturation((float) (progress / 100.0));
65. Paint paint = new Paint();
66. paint.setColorFilter(new ColorMatrixColorFilter(cMatrix));
68. Canvas canvas = new Canvas(bmp);
69. // 在Canvas上繪制一個已經存在的Bitmap。這樣，dstBitmap就和srcBitmap一摸一樣了
70. canvas.drawBitmap(srcBitmap, 0, 0, paint);
72. dstimage.setImageBitmap(bmp);
74. }
76. public void onStartTrackingTouch(SeekBar bar) {
77. }
79. public void onStopTrackingTouch(SeekBar bar) {
80. }
81. });
83. BrightnessseekBar
84. .setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
85. // 當拖動條的滑塊位置發生改變時觸發該方法
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,// 改變亮度
94. 0, 0, 1, 0, brightness, 0, 0, 0, 1, 0 });
96. Paint paint = new Paint();
97. paint.setColorFilter(new ColorMatrixColorFilter(cMatrix));
99. Canvas canvas = new Canvas(bmp);
100. // 在Canvas上繪制一個已經存在的Bitmap。這樣，dstBitmap就和srcBitmap一摸一樣了
101. canvas.drawBitmap(srcBitmap, 0, 0, paint);
102. dstimage.setImageBitmap(bmp);
104. }
106. public void onStartTrackingTouch(SeekBar bar) {
107. }
109. public void onStopTrackingTouch(SeekBar bar) {
110. }
111. });
113. ContrastseekBar
114. .setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
115. // 當拖動條的滑塊位置發生改變時觸發該方法
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 + 64) / 128.0);
122. ColorMatrix cMatrix = new ColorMatrix();
123. cMatrix.set(new float[] { contrast, 0, 0, 0, 0, 0,
124. contrast, 0, 0, 0,// 改變對比度
125. 0, 0, contrast, 0, 0, 0, 0, 0, 1, 0 });
127. Paint paint = new Paint();
128. paint.setColorFilter(new ColorMatrixColorFilter(cMatrix));
130. Canvas canvas = new Canvas(bmp);
131. // 在Canvas上繪制一個已經存在的Bitmap。這樣，dstBitmap就和srcBitmap一摸一樣了
132. canvas.drawBitmap(srcBitmap, 0, 0, paint);
134. dstimage.setImageBitmap(bmp);
135. }
137. public void onStartTrackingTouch(SeekBar arg0) {
138. // TODO Auto-generated method stub
140. }
142. public void onStopTrackingTouch(SeekBar seekBar) {
143. // TODO Auto-generated method stub
144. }
145. });
146. }
148. /**
149. * 需要加載的圖片可能是大圖，我們需要對其進行合適的縮小處理
150. *
151. * @param imageUri
152. */
153. private Bitmap getSrcImage(Uri imageUri) {
154. try {
155. BitmapFactory.Options ops = new BitmapFactory.Options();
156. ops.inJustDecodeBounds = true;
157. Bitmap bmp = BitmapFactory.decodeStream(this.getContentResolver()
158. .openInputStream(imageUri), null, ops);
159. int wRatio = (int) Math.ceil(ops.outWidth / (float) MAX_WIDTH);
160. int hRatio = (int) Math.ceil(ops.outHeight / (float) MAX_HEIGHT);
162. if (wRatio > 1 && hRatio > 1) {
163. if (wRatio > hRatio) {
164. ops.inSampleSize = wRatio;
165. } else {
166. ops.inSampleSize = hRatio;
167. }
168. }
170. ops.inJustDecodeBounds = false;
171. bmp = BitmapFactory.decodeStream(this.getContentResolver()
172. .openInputStream(imageUri), null, ops);
174. return bmp;
176. } catch (FileNotFoundException e) {
177. // TODO Auto-generated catch block
178. e.printStackTrace();
179. Log.e(this.getClass().getName(), e.getMessage());
180. }
182. return null;
183. }
184. }