Emboss Effect on image in ImageView (Android)

Before Emboss Effect

After Emboss Effect

Create new Android Project
Project Name: PlayingwithBitmaps
Build Target: Android 2.3.3   //or greater than that
Application Name: PlayingwithBitmaps
Package Name: com.hamad.playingwithbitmaps
Create Activity: Main
Min SDK: 10 // or greater than that

  1. create main layout:

• One image view to display the image.

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:background="#000000"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    >
    <ImageView
        android:id="@+id/imViewAndroid"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
  android:layout_centerInParent="true"
  android:src="@drawable/sharpness_high"
    />
</RelativeLayout>

  2. code of main activity:

package com.hamad.playingwithbitmaps;

import android.os.Bundle;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.BlurMaskFilter;
import android.graphics.PorterDuff;
import android.graphics.BlurMaskFilter.Blur;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.view.Menu;
import android.widget.ImageView;

public class Main extends Activity {
    ImageView imViewAndroid;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        imViewAndroid = (ImageView) findViewById(R.id.imViewAndroid);
         imViewAndroid.setImageBitmap(doEmboss(BitmapFactory.decodeResource(getResources(), R.drawable.sharpness_high)));
 }
 public Bitmap doEmboss(Bitmap src) {
     // set Emboss configuration
     double[][] EmbossConfig = new double[][] {
         { -1 ,  0, -1 },
         {  0 ,  4,  0 },
         { -1 ,  0, -1 }
     };
   //create convolution matrix instance
     ConvolutionMatrix convMatrix = new ConvolutionMatrix(3);
      //apply configuration
     convMatrix.applyConfig(EmbossConfig);
     // set weight of factor and offset
     convMatrix.Factor = 1;
     convMatrix.Offset = 127;
     return ConvolutionMatrix.computeConvolution3x3(src, convMatrix);
 }
}

  3. note that:

• For better understanding please refer to my previous post:convolution matrix
• With the help of this,doEmboss() method you can apply Emboss Effect on image on click,on action_down etc.

   4. conclusion:

• Some deep information about Emboss effect .
• Know how to apply Emboss effect on image bitmap from drawables.

  5. about the post:

[ -1 | 0 | -1 ][ 0 | 4 | 0 ][ -1 | 0 | -1 ]The factor is 1 and offset is 127.

•  The code seems to explain itself due to comments, and is very easy to understand.
•  Don’t mind to write a comment whatever you like to ask, to know,to suggest or recommend.
•  Hope you enjoy it!

  6. source code:

        you can download the source code here

Cheers,

Hamad Ali Shaikh