Home > Tutorials > Image Processing – Watermarking On The Fly

Image Processing – Watermarking On The Fly

Having a little free time, I’ve just been digging on this technique. A little trick with canvas and drawing, I’ve got an image with watermark, so cool!!!

This is how it looks:

Image w/ Watermark

Image w/ Watermark

Here the implementation:

	public static Bitmap mark(Bitmap src, String watermark, Point location, Color color, int alpha, int size, boolean underline) {
		int w = src.getWidth();
		int h = src.getHeight();
		Bitmap result = Bitmap.createBitmap(w, h, src.getConfig());

		Canvas canvas = new Canvas(result);
		canvas.drawBitmap(src, 0, 0, null);

		Paint paint = new Paint();
		canvas.drawText(watermark, location.x, location.y, paint);

		return result;

Hope you like it!

Pete Houston

  1. June 7, 2016 at 4:41 pm

    cant save image, I have added permission external storage one, still its showing permission denied for folders present inside, and if I write newFolder, it says no such Directory find

  2. Farhaan
    July 31, 2014 at 7:45 pm

    I have added watermark on image using above code. Is there any way to remove that watermark?

  3. July 18, 2014 at 2:19 pm

    hello i had saw your tutorial but dont understand what is Point location in your function ?

  4. Ankur Sharma
    July 16, 2014 at 8:54 pm

    sorry it isnt letting me to post an xml text .. u can make a edittext to enter the desired text and a button to clear the edited image .. and if u want a save button can also be added . thanks

    • Ankur Sharma
      July 16, 2014 at 8:55 pm

      also an imageview of course to ad an image frm the drawable or gallery.

  5. July 7, 2014 at 9:52 pm

    Can u give me your code? I don’t understand how to use your tutorial.

  6. November 7, 2012 at 2:20 pm

    can u show me , what Point location? and how I call this function?? thanks🙂

    • Ankur Sharma
      July 16, 2014 at 8:50 pm

      Touch to watermark with entered text :–

      Make this class with class name TextAd.

      import android.app.Activity;
      import android.graphics.Bitmap;
      import android.graphics.BitmapFactory;
      import android.graphics.Canvas;
      import android.graphics.Color;
      import android.graphics.Paint;
      import android.os.Bundle;
      import android.util.DisplayMetrics;
      import android.view.MotionEvent;
      import android.view.View;
      import android.view.View.OnClickListener;
      import android.view.View.OnTouchListener;
      import android.view.Window;
      import android.widget.Button;
      import android.widget.EditText;
      import android.widget.ImageView;

      import com.example.photogallery.MainActivity;

      public class TextAd extends Activity {

      Bitmap originalBitmap,image;
      ImageView iv_ttx;
      EditText et_sample;

      Paint paint;
      protected void onCreate(Bundle savedInstanceState) {
      //image view
      iv_ttx = (ImageView) findViewById(R.id.iv_ttx);

      DisplayMetrics displaymetrics = new DisplayMetrics();


      //dimentions x,y of device to create a scaled bitmap having similar dimentions to screen size

      int height1 = displaymetrics.heightPixels;
      int width1 = displaymetrics.widthPixels;

      //paint object to define paint properties

      paint = new Paint();

      //loading bitmap from drawable

      originalBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.ic_action_search);

      //scaling of bitmap

      originalBitmap =Bitmap.createScaledBitmap(originalBitmap, width1, height1, false);

      //creating anoter copy of bitmap to be used for editing

      image = originalBitmap.copy(Bitmap.Config.RGB_565, true);

      et_sample =(EditText) findViewById(R.id.et_txt);

      // Button btn_save_img = (Button) findViewById(R.id.btn_save_image);

      Button btn_clr_all = (Button) findViewById(R.id.btn_clr_all);

      btn_clr_all.setOnClickListener(new OnClickListener() {

      public void onClick(View v) {
      // TODO Auto-generated method stub
      //loading original bitmap again (undoing all editing)
      image = originalBitmap.copy(Bitmap.Config.RGB_565, true);

      /*btn_save_img.setOnClickListener(new OnClickListener() {

      public void onClick(View arg0) {
      // TODO Auto-generated method stub
      //funtion save image is called with bitmap image as parameter
      // saveImage(image);


      iv_ttx.setOnTouchListener(new OnTouchListener() {

      public boolean onTouch(View arg0, MotionEvent arg1) {
      // TODO Auto-generated method stub
      String user_text=et_sample.getText().toString();
      //gettin x,y cordinates on screen touch
      float scr_x=arg1.getRawX();
      float scr_y=arg1.getRawY();
      //funtion called to perform drawing
      return true;


      /*void saveImage(Bitmap img) {
      String RootDir = Environment.getExternalStorageDirectory()
      + File.separator + “txt_imgs”;
      File myDir=new File(RootDir);
      Random generator = new Random();
      int n = 10000;
      n = generator.nextInt(n);
      String fname = “Image-“+ n +”.jpg”;
      File file = new File (myDir, fname);
      if (file.exists ()) file.delete ();
      try {
      FileOutputStream out = new FileOutputStream(file);

      img.compress(Bitmap.CompressFormat.JPEG, 90, out);
      } catch (Exception e) {


      public Bitmap createImage(float scr_x,float scr_y,String user_text){
      //canvas object with bitmap image as constructor
      Canvas canvas = new Canvas(image);
      int viewTop = getWindow().findViewById(Window.ID_ANDROID_CONTENT).getTop();
      //removing title bar hight
      scr_y=scr_y- viewTop;
      //fuction to draw text on image. you can try more drawing funtions like oval,point,rect,etc…
      canvas.drawText(“”+user_text, scr_x, scr_y, paint);
      return image;


      Make a layout with name adtext : —

      Touch on the screen and your text with be embeded on the image . set the image in your drawable folder and give its path in the xml. or bring it frm the gallery. enjoy coding .

      • Ankur Sharma
        July 16, 2014 at 8:52 pm

        Your layout will look like this : —

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