简单制作调色板
protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); SeekBar sb = (SeekBar) findViewById(R.id.sb); final ImageView iv = (ImageView) findViewById(R.id.iv); //找到原图 final Bitmap srcBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.a1); //复制副本 final Bitmap copyBitmap = Bitmap.createBitmap(srcBitmap.getWidth(), srcBitmap.getHeight(), srcBitmap.getConfig()); //开始编辑 final Canvas canvas=new Canvas(copyBitmap); final Matrix matrix=new Matrix(); final Paint paint=new Paint(); canvas.drawBitmap(srcBitmap, matrix, paint); //根据seekbar设置颜色 sb.setOnSeekBarChangeListener(new OnSeekBarChangeListener() { @Override public void onStopTrackingTouch(SeekBar seekBar) { // TODO Auto-generated method stub int progress = seekBar.getProgress(); float val = progress / 50.0f;// val 值 0 ~ 1 ~ 2 //val 0~1 0.5 偏青 //val 1~2 1.5 偏红 //颜色数组，调色调 ColorMatrix cm = new ColorMatrix(); cm.set(new float[] { 1 , 0, 0, 0, 0, //红色R 0, 1* val, 0, 0, 0, //绿色G 0, 0, 1, 0, 0, //蓝色B 0, 0, 0, 1, 0 //透明度A }); paint.setColorFilter(new ColorMatrixColorFilter(cm)); canvas.drawBitmap(srcBitmap, matrix, paint); iv.setImageBitmap(copyBitmap); } @Override public void onStartTrackingTouch(SeekBar seekBar) { // TODO Auto-generated method stub } @Override public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) { // TODO Auto-generated method stub } }); //将图写入iv iv.setImageBitmap(copyBitmap); }
