Before Sharpness change
After Sharpness change
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
- 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:layout_width="match_parent" android:layout_height="match_parent" android:background="#000000" android:id="@+id/rlMain" > <ImageView android:id="@+id/imViewAndroid" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:src="@drawable/beautiful" /> </RelativeLayout>
2. code of main activity:
package com.shaikhhamadali.blogspot.playingwithbitmaps; import android.os.Bundle; import android.app.Activity; import android.graphics.Bitmap; import android.graphics.BitmapFactory; 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(sharpenImage(BitmapFactory.decodeResource(getResources(), R.drawable.beautiful),12)); } public Bitmap sharpenImage(Bitmap src, double weight) { // set sharpness configuration double[][] SharpConfig = new double[][] { { 0 , -2 , 0 }, { -2, weight, -2 }, { 0 , -2 , 0 } }; //create convolution matrix instance ConvolutionMatrix convMatrix = new ConvolutionMatrix(3); //apply configuration convMatrix.applyConfig(SharpConfig); //set weight according to factor convMatrix.Factor = weight - 8; return ConvolutionMatrix.computeConvolution3x3(src, convMatrix); }}
- code of ConvolutionMatrix Class:
package com.shaikhhamadali.blogspot.playingwithbitmaps; import android.graphics.Bitmap; import android.graphics.Color; public class ConvolutionMatrix { public static final int SIZE = 3; public double[][] Matrix; public double Factor = 1; public double Offset = 1; //Constructor with argument of size public ConvolutionMatrix(int size) { Matrix = new double[size][size]; } public void setAll(double value) { for (int x = 0; x < SIZE; ++x) { for (int y = 0; y < SIZE; ++y) { Matrix[x][y] = value; } } } public void applyConfig(double[][] config) { for(int x = 0; x < SIZE; ++x) { for(int y = 0; y < SIZE; ++y) { Matrix[x][y] = config[x][y]; } } } public static Bitmap computeConvolution3x3(Bitmap src, ConvolutionMatrix matrix) { int width = src.getWidth(); int height = src.getHeight(); Bitmap result = Bitmap.createBitmap(width, height, src.getConfig()); int A, R, G, B; int sumR, sumG, sumB; int[][] pixels = new int[SIZE][SIZE]; for(int y = 0; y < height - 2; ++y) { for(int x = 0; x < width - 2; ++x) { // get pixel matrix for(int i = 0; i < SIZE; ++i) { for(int j = 0; j < SIZE; ++j) { pixels[i][j] = src.getPixel(x + i, y + j); } } // get alpha of center pixel A = Color.alpha(pixels[1][1]); // init color sum sumR = sumG = sumB = 0; // get sum of RGB on matrix for(int i = 0; i < SIZE; ++i) { for(int j = 0; j < SIZE; ++j) { sumR += (Color.red(pixels[i][j]) * matrix.Matrix[i][j]); sumG += (Color.green(pixels[i][j]) * matrix.Matrix[i][j]); sumB += (Color.blue(pixels[i][j]) * matrix.Matrix[i][j]); } } // get final Red R = (int)(sumR / matrix.Factor + matrix.Offset); if(R < 0) { R = 0; } else if(R > 255) { R = 255; } // get final Green G = (int)(sumG / matrix.Factor + matrix.Offset); if(G < 0) { G = 0; } else if(G > 255) { G = 255; } // get final Blue B = (int)(sumB / matrix.Factor + matrix.Offset); if(B < 0) { B = 0; } else if(B > 255) { B = 255; } // apply new pixel result.setPixel(x + 1, y + 1, Color.argb(A, R, G, B)); } } // final image return result; } }
3. note that:
- Refer to my previous post:convolution matrix
- With the help of this,sharpenImage() method you can set the sharpness of image (increase,decrease) on click,on action_down etc.
- Some deep information about sharpness.
- Know how to set sharpness of an image bitmap from drawables.
5. About the post:
The applied matrix is:
[ 0 | -2 | 0 ][ -2 | 11 | -2 ][ 0 | -2 | 0 ]The factor is 3 and offset is 0.
- 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,
you can download the source code here
Hamad Ali Shaikh