Android改变图像的饱和度、亮度和对比度

来源：互联网发布：linux中打开一个文件编辑：程序博客网时间：2024/05/13 01:40

转自：http://blog.csdn.net/sxwyf248/article/details/7019731

运行结果：

使用到了ColorMatrix。

Java代码：

[java] view plaincopy
package com.figo.imgedit;  
  
import java.io.FileNotFoundException;  
  
import android.app.Activity;  
import android.graphics.Bitmap;  
import android.graphics.Bitmap.Config;  
import android.graphics.BitmapFactory;  
import android.graphics.Canvas;  
import android.graphics.ColorMatrix;  
import android.graphics.ColorMatrixColorFilter;  
import android.graphics.Paint;  
import android.net.Uri;  
import android.os.Bundle;  
import android.util.Log;  
import android.widget.ImageView;  
import android.widget.SeekBar;  
import android.widget.SeekBar.OnSeekBarChangeListener;  
  
public class ImgeditActivity extends Activity {  
    /** Called when the activity is first created. */  
    private Bitmap srcBitmap, dstBitmap;  
    private String pathName = "/sdcard/testimg.jpg";  
  
    private ImageView dstimage = null;  
    private SeekBar SaturationseekBar = null;  
    private SeekBar BrightnessseekBar = null;  
    private SeekBar ContrastseekBar = null;  
    private int imgHeight, imgWidth;  
  
    public static final int PICTURE = 0;  
    public static final int MAX_WIDTH = 240;  
    public static final int MAX_HEIGHT = 240;  
    private Uri imageUri;  
  
    @Override  
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.main);  
  
        dstimage = (ImageView) findViewById(R.id.dstImageView);  
        SaturationseekBar = (SeekBar) findViewById(R.id.Saturationseekbar);  
        BrightnessseekBar = (SeekBar) findViewById(R.id.Brightnessseekbar);  
        ContrastseekBar = (SeekBar) findViewById(R.id.Contrastseekbar);  
  
        srcBitmap = BitmapFactory.decodeFile(pathName);  
        dstimage.setImageBitmap(srcBitmap);  
        imgHeight = srcBitmap.getHeight();  
        imgWidth = srcBitmap.getWidth();  
  
        dstBitmap = Bitmap.createBitmap(imgWidth, imgHeight, Config.ARGB_8888);  
  
        SaturationseekBar  
                .setOnSeekBarChangeListener(new OnSeekBarChangeListener() {  
                    // 当拖动条的滑块位置发生改变时触发该方法  
                    public void onProgressChanged(SeekBar arg0, int progress,  
                            boolean fromUser) {  
                        // 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  
                        Bitmap bmp = Bitmap.createBitmap(imgWidth, imgHeight,  
                                Config.ARGB_8888);  
                        ColorMatrix cMatrix = new ColorMatrix();  
                        // 设置饱和度  
                        cMatrix.setSaturation((float) (progress / 100.0));  
  
                        Paint paint = new Paint();  
                        paint.setColorFilter(new ColorMatrixColorFilter(cMatrix));  
  
                        Canvas canvas = new Canvas(bmp);  
                        // 在Canvas上绘制一个已经存在的Bitmap。这样，dstBitmap就和srcBitmap一摸一样了  
                        canvas.drawBitmap(srcBitmap, 0, 0, paint);  
  
                        dstimage.setImageBitmap(bmp);  
  
                    }  
  
                    public void onStartTrackingTouch(SeekBar bar) {  
                    }  
  
                    public void onStopTrackingTouch(SeekBar bar) {  
                    }  
                });  
  
        BrightnessseekBar  
                .setOnSeekBarChangeListener(new OnSeekBarChangeListener() {  
                    // 当拖动条的滑块位置发生改变时触发该方法  
                    public void onProgressChanged(SeekBar arg0, int progress,  
                            boolean fromUser) {  
                        Bitmap bmp = Bitmap.createBitmap(imgWidth, imgHeight,  
                                Config.ARGB_8888);  
                        int brightness = progress - 127;  
                        ColorMatrix cMatrix = new ColorMatrix();  
                        cMatrix.set(new float[] { 1, 0, 0, 0, brightness, 0, 1,  
                                0, 0, brightness,// 改变亮度  
                                0, 0, 1, 0, brightness, 0, 0, 0, 1, 0 });  
  
                        Paint paint = new Paint();  
                        paint.setColorFilter(new ColorMatrixColorFilter(cMatrix));  
  
                        Canvas canvas = new Canvas(bmp);  
                        // 在Canvas上绘制一个已经存在的Bitmap。这样，dstBitmap就和srcBitmap一摸一样了  
                        canvas.drawBitmap(srcBitmap, 0, 0, paint);  
                        dstimage.setImageBitmap(bmp);  
  
                    }  
  
                    public void onStartTrackingTouch(SeekBar bar) {  
                    }  
  
                    public void onStopTrackingTouch(SeekBar bar) {  
                    }  
                });  
  
        ContrastseekBar  
                .setOnSeekBarChangeListener(new OnSeekBarChangeListener() {  
                    // 当拖动条的滑块位置发生改变时触发该方法  
                    public void onProgressChanged(SeekBar arg0, int progress,  
                            boolean fromUser) {  
                        Bitmap bmp = Bitmap.createBitmap(imgWidth, imgHeight,  
                                Config.ARGB_8888);  
                        // int brightness = progress - 127;  
                        float contrast = (float) ((progress + 64) / 128.0);  
                        ColorMatrix cMatrix = new ColorMatrix();  
                        cMatrix.set(new float[] { contrast, 0, 0, 0, 0, 0,  
                                contrast, 0, 0, 0,// 改变对比度  
                                0, 0, contrast, 0, 0, 0, 0, 0, 1, 0 });  
  
                        Paint paint = new Paint();  
                        paint.setColorFilter(new ColorMatrixColorFilter(cMatrix));  
  
                        Canvas canvas = new Canvas(bmp);  
                        // 在Canvas上绘制一个已经存在的Bitmap。这样，dstBitmap就和srcBitmap一摸一样了  
                        canvas.drawBitmap(srcBitmap, 0, 0, paint);  
  
                        dstimage.setImageBitmap(bmp);  
                    }  
  
                    public void onStartTrackingTouch(SeekBar arg0) {  
                        // TODO Auto-generated method stub  
  
                    }  
  
                    public void onStopTrackingTouch(SeekBar seekBar) {  
                        // TODO Auto-generated method stub  
                    }  
                });  
    }  
  
    /** 
     * 需要加载的图片可能是大图，我们需要对其进行合适的缩小处理 
     *  
     * @param imageUri 
     */  
    private Bitmap getSrcImage(Uri imageUri) {  
        try {  
            BitmapFactory.Options ops = new BitmapFactory.Options();  
            ops.inJustDecodeBounds = true;  
            Bitmap bmp = BitmapFactory.decodeStream(this.getContentResolver()  
                    .openInputStream(imageUri), null, ops);  
            int wRatio = (int) Math.ceil(ops.outWidth / (float) MAX_WIDTH);  
            int hRatio = (int) Math.ceil(ops.outHeight / (float) MAX_HEIGHT);  
  
            if (wRatio > 1 && hRatio > 1) {  
                if (wRatio > hRatio) {  
                    ops.inSampleSize = wRatio;  
                } else {  
                    ops.inSampleSize = hRatio;  
                }  
            }  
  
            ops.inJustDecodeBounds = false;  
            bmp = BitmapFactory.decodeStream(this.getContentResolver()  
                    .openInputStream(imageUri), null, ops);  
  
            return bmp;  
  
        } catch (FileNotFoundException e) {  
            // TODO Auto-generated catch block  
            e.printStackTrace();  
            Log.e(this.getClass().getName(), e.getMessage());  
        }  
  
        return null;  
    }  
}  

布局文件，比较简单：

[html] view plaincopy
<?xml version="1.0" encoding="utf-8"?>  
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    android:layout_width="fill_parent" android:layout_height="fill_parent"  
    android:orientation="vertical">  
  
    <ImageView android:id="@+id/dstImageView" android:scaleType="fitCenter"  
        android:layout_width="fill_parent" android:layout_height="wrap_content"  
        android:maxWidth="240px" android:maxHeight="240px" />  
  
    <LinearLayout android:layout_width="fill_parent"  
        android:layout_height="wrap_content" android:orientation="vertical">  
        <LinearLayout android:layout_width="fill_parent"  
            android:layout_height="wrap_content" android:orientation="horizontal"  
            android:layout_alignParentBottom="true" android:gravity="center_vertical">  
  
            <TextView android:layout_width="wrap_content"  
                android:layout_height="wrap_content" android:text="@string/Saturation" />  
  
            <!-- 定义一个拖动条，并改变它的滑块外观 -->  
            <SeekBar android:id="@+id/Saturationseekbar"  
                android:layout_width="fill_parent" android:layout_height="wrap_content"  
                android:progress="100" android:max="200" />  
        </LinearLayout>  
  
        <LinearLayout android:layout_width="fill_parent"  
            android:layout_height="wrap_content" android:orientation="horizontal"  
            android:gravity="center_vertical">  
  
            <TextView android:layout_width="wrap_content"  
                android:layout_height="wrap_content" android:text="@string/Brightness" />  
  
            <!-- 定义一个拖动条，并改变它的滑块外观 -->  
            <SeekBar android:id="@+id/Brightnessseekbar"  
                android:layout_width="fill_parent" android:layout_height="wrap_content"  
                android:progress="127" android:max="255" />  
        </LinearLayout>  
  
        <LinearLayout android:layout_width="fill_parent"  
            android:layout_height="wrap_content" android:orientation="horizontal"  
            android:gravity="center_vertical">  
  
            <TextView android:layout_width="wrap_content"  
                android:layout_height="wrap_content" android:text="@string/Contrast" />  
  
            <!-- 定义一个拖动条，并改变它的滑块外观 -->  
            <SeekBar android:id="@+id/Contrastseekbar"  
                android:layout_width="fill_parent" android:layout_height="wrap_content"  
                android:progress="63" android:max="127" />  
        </LinearLayout>  
    </LinearLayout>  
</LinearLayout>  

0 0