android 图像颜色处理 图像的亮度变换 更改图片饱和度

图像颜色处理

颜色矩阵 ColorMatrix cm = new
ColorMatrix();

paint.setColorFilter(new
ColorMatrixColorFilter(cm));

1 0 0 0 0

0 1 0 0 0

0 0 1 0 0

0 0 0 1 0

New Red Value = 1*128 + 0*128 + 0*128+ 0*0 + 0

New Blue Value = 0*128 + 1*128 +0*128 + 0*0 + 0

New Green Value = 0*128 + 0*128 +1*128 + 0*0 + 0

New Alpha Value = 0*128 + 0*128 +0*128 + 1*0 + 0

ColorMatrix cm = new
ColorMatrix();

cm.set(new float[] {

2, 0, 0, 0, 0,

0, 1, 0, 0, 0,

0, 0, 1, 0, 0,

0, 0, 0, 1, 0

});

paint.setColorFilter(new
ColorMatrixColorFilter(cm));

图像的亮度变换

ColorMatrix cm = new
ColorMatrix();

float contrast = 2;

cm.set(new float[] {

contrast, 0, 0, 0, 0,

0, contrast, 0, 0, 0,

0, 0, contrast, 0, 0,

0, 0, 0, 1, 0 });

paint.setColorFilter(new
ColorMatrixColorFilter(cm));

更改图片饱和度

ColorMatrix cm = new
ColorMatrix();

cm.setSaturation(.5f);

paint.setColorFilter(new
ColorMatrixColorFilter(cm));

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public class MainActivity extends Activity {

private ImageView iv_src;

private ImageView iv_dest;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

iv_src = (ImageView) findViewById(R.id.iv_src);

iv_src.setImageBitmap(BitmapFactory.decodeFile("/sdcard/tom.png"));

iv_dest = (ImageView) findViewById(R.id.iv_dest);

}

public void click(View view) {

Bitmap bitmap = BitmapFactory.decodeFile("/sdcard/tom.png");

Bitmap source = Bitmap.createBitmap(bitmap.getWidth(),

bitmap.getHeight(), bitmap.getConfig());

Matrix matrix = new Matrix();

ColorMatrix cm = new ColorMatrix();

cm.set(new float[] {

2, 0, 0, 0, 0,

0, 1, 0, 0, 0,

0, 0, 1, 0, 0,

0, 0, 0, 1, 0

});

Paint paint = new Paint();

paint.setColorFilter(new ColorMatrixColorFilter(cm));

Bitmap baseBitmap = Bitmap.createBitmap(source, 0, 0, source.getWidth(), source.getHeight(), matrix, false);

Canvas canvas = new Canvas(baseBitmap);

canvas.drawBitmap(bitmap, matrix, paint);

iv_dest.setImageBitmap(baseBitmap);

}

}

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public class MainActivity extends Activity implements OnSeekBarChangeListener {

private ImageView iv;

private SeekBar sb_red;

private SeekBar sb_green;

private SeekBar sb_blue;

private SeekBar sb_brightness; //亮度

private SeekBar sb_saturation; //饱和度

private Bitmap preBitmap;

private Bitmap afterBitmap;

private Canvas canvas;

ColorMatrix matrix;

private Paint paint;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

initData();

initLintener();

}

private void initData() {

this.iv = (ImageView) this.findViewById(R.id.iv);

this.sb_red = (SeekBar) this.findViewById(R.id.sb_red);

this.sb_green = (SeekBar) this.findViewById(R.id.sb_green);

this.sb_blue = (SeekBar) this.findViewById(R.id.sb_blue);

this.sb_brightness = (SeekBar) this.findViewById(R.id.sb_brightness);

this.sb_saturation = (SeekBar) this.findViewById(R.id.sb_saturation);

Options opts = new Options();

opts.inSampleSize = 2;

// 从资源文件获取一张不可修改的图片

this.preBitmap = BitmapFactory.decodeResource(getResources(),

R.drawable.after,opts );

// 创建一张可以被修改的空白图片

this.afterBitmap = Bitmap.createBitmap(

this.preBitmap.getWidth(), this.preBitmap.getHeight(),

this.preBitmap.getConfig());

// 以空白图片为模版创建一张画布

this.canvas = new Canvas(this.afterBitmap);

// 创建画笔

this.paint = new Paint();

// 创建颜色矩阵

this.matrix = new ColorMatrix();

this.canvas.drawBitmap(this.preBitmap, new Matrix(), this.paint);

this.iv.setImageBitmap(afterBitmap);

}

private void initLintener() {

this.sb_red.setOnSeekBarChangeListener(this);

this.sb_green.setOnSeekBarChangeListener(this);

this.sb_blue.setOnSeekBarChangeListener(this);

this.sb_brightness.setOnSeekBarChangeListener(this);

this.sb_saturation.setOnSeekBarChangeListener(this);

}

@Override

public void onProgressChanged(SeekBar seekBar, int progress,

boolean fromUser) {

switch (seekBar.getId()) {

case R.id.sb_red:

this.matrix.set(new float[]{

progress/128f,0,0,0,0,//红色

0,1,0,0,0,

0,0,1,0,0,

0,0,0,1,0

});

break;

case R.id.sb_green:

this.matrix.set(new float[]{

1,0,0,0,0,

0,progress/128f,0,0,0,//绿色

0,0,1,0,0,

0,0,0,1,0

});

break;

case R.id.sb_blue:

this.matrix.set(new float[]{

1,0,0,0,0,

0,1,0,0,0,

0,0,progress/128f,0,0, // 蓝色

0,0,0,1,0

});

break;

case R.id.sb_brightness:

this.matrix.set(new float[]{

progress/128f,0,0,0,0,

0,progress/128f,0,0,0,

0,0,progress/128f,0,0,

0,0,0,1,0

});

break;

case R.id.sb_saturation:

this.matrix.setSaturation(progress/128f);

break;

}

this.paint.setColorFilter(new ColorMatrixColorFilter(matrix));

this.canvas.drawBitmap(this.preBitmap, new Matrix(), this.paint);

this.iv.setImageBitmap(afterBitmap);

}

@Override

public void onStartTrackingTouch(SeekBar seekBar) {

}

@Override

public void onStopTrackingTouch(SeekBar seekBar) {

// TODO Auto-generated method stub

}

}

整理自ppt和相应源码