Android编程之图片颜色处理方法

bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.b); updateBitmap = Bitmap.createBitmap(bitmap.getWidth(),

bitmap.getHeight(), bitmap.getConfig()); canvas = new Canvas(updateBitmap);

paint = new Paint(); final ColorMatrix cm = new ColorMatrix();

paint.setColorFilter(new ColorMatrixColorFilter(cm)); paint.setColor(Color.BLACK);

paint.setAntiAlias(true); final Matrix matrix = new Matrix();

canvas.drawBitmap(bitmap, matrix, paint); iv.setImageBitmap(updateBitmap);

/** * RGB三原色红色值的设置

*/ sb1.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {

@Override public void onStopTrackingTouch(SeekBar seekBar) {

int progress = seekBar.getProgress(); cm.set(new float[] { progress / 128f, 0, 0, 0, 0,// 红色值

0, 1, 0, 0, 0,// 绿色值 0, 0, 1, 0, 0,// 蓝色值

0, 0, 0, 1, 0 // 透明度 });

paint.setColorFilter(new ColorMatrixColorFilter(cm)); canvas.drawBitmap(bitmap, matrix, paint);

iv.setImageBitmap(updateBitmap); }

@Override public void onStartTrackingTouch(SeekBar seekBar) {

} @Override

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

} });

/** * RGB三原色绿色值的设置

*/ sb2.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {

@Override public void onStopTrackingTouch(SeekBar seekBar) {

int progress = seekBar.getProgress(); cm.set(new float[] { 1, 0, 0, 0, 0,// 红色值

0, progress / 128f, 0, 0, 0,// 绿色值 0, 0, 1, 0, 0,// 蓝色值