Android学习笔记之-：对Android图像色调饱和度亮度处理

首先也简单介绍下图像的RGBA模型，R指红色（Red），G指绿色（Green），B指蓝色（Blue）及A指透明度（Alpha），由这四种元素搭配组合成了各种各样的颜色。

处理工具类及方法：

public class ImageTools {

/**

* 对图片进行处理

* @description：

* @date 2015-8-12 下午8:45:05

*/

public static Bitmap getColorImage(Bitmap bitmap, float sx, float bhd, float ld) {// 参数分别是色相，饱和度和亮度

Bitmap bmp = bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Bitmap.Config.ARGB_8888);

Canvas canvas = new Canvas(bmp);

Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);

ColorMatrix sxMatrix = new ColorMatrix();// 设置色调

sxMatrix.setRotate(0, sx);

sxMatrix.setRotate(1, sx);

sxMatrix.setRotate(2, sx);

ColorMatrix bhdMatrix = new ColorMatrix();// 设置饱和度

bhdMatrix.setSaturation(bhd);

ColorMatrix ldMatrix = new ColorMatrix();// 设置亮度

ldMatrix.setScale(ld, ld, ld, 1);

ColorMatrix mixMatrix = new ColorMatrix();// 设置整体效果

mixMatrix.postConcat(sxMatrix);

mixMatrix.postConcat(bhdMatrix);

mixMatrix.postConcat(ldMatrix);

paint.setColorFilter(new ColorMatrixColorFilter(mixMatrix));// 用颜色过滤器过滤

canvas.drawBitmap(bmp, 0, 0, paint);// 重新画图

return bmp;

}

}

在Activity中选择要处理的ImageView及对应的Bitmap，调用工具类中方法即可：

private ImageView colorIv;

private SeekBar sxBar, bhdBar, ldBar;

private static int MIN_COLOR = 100;

private static int MAX_COLOR = 255;

private float sx, bhd, ld;

private Bitmap bmp;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.color_main);

initViews();

}

private void initViews() {

bmp=BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);

colorIv = (ImageView) findViewById(R.id.color_iv);

colorIv.setImageBitmap(bmp);

sxBar = (SeekBar) findViewById(R.id.sx_seekbar);

bhdBar = (SeekBar) findViewById(R.id.bhd_seekbar);

ldBar = (SeekBar) findViewById(R.id.ld_seekbar);

sxBar.setOnSeekBarChangeListener(this);

sxBar.setMax(MAX_COLOR);// 设置最大值

sxBar.setProgress(MIN_COLOR);// 设置初始值（当前值）

bhdBar.setOnSeekBarChangeListener(this);

bhdBar.setMax(MAX_COLOR);

bhdBar.setProgress(MIN_COLOR);

ldBar.setOnSeekBarChangeListener(this);

ldBar.setMax(MAX_COLOR);

ldBar.setProgress(MIN_COLOR);

}

@Override

public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {

switch (seekBar.getId()) {

case R.id.sx_seekbar:

sx = (progress - MIN_COLOR) * 1.0f / MIN_COLOR * 180;

break;

case R.id.bhd_seekbar:

bhd = progress * 1.0f / MIN_COLOR;

break;

case R.id.ld_seekbar:

ld = progress * 1.0f / MIN_COLOR;

break;

}

colorIv.setImageBitmap(ImageTools.getColorImage(bmp, sx, bhd, ld));

}

@Override

public void onStartTrackingTouch(SeekBar seekBar) {

}

@Override

public void onStopTrackingTouch(SeekBar seekBar) {

}

xml布局文件：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent" >

<ImageView

android:id="@+id/color_iv"

android:layout_width="300dp"

android:layout_height="300dp"

android:layout_centerHorizontal="true"

android:layout_marginBottom="15dp"

android:layout_marginTop="15dp" />

<SeekBar

android:id="@+id/sx_seekbar"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_below="@id/color_iv"

/>

<SeekBar

android:id="@+id/bhd_seekbar"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_below="@id/sx_seekbar"

android:layout_marginTop="10dp" />

<SeekBar

android:id="@+id/ld_seekbar"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_below="@id/bhd_seekbar"

android:layout_marginTop="10dp" />

</RelativeLayout>