Photo Sketch Effect for android

Please use below class and pass the bitmap to this function and get return bitmap with Sketch effect.You can also customize the value and get the customization of sketch effect.

public class Sketch {

      //  type = 3(Negative), 4(Pencil Sketch), 5(Color Pencil Sketch)

      public static final Bitmap changeToSketch(Bitmap bitmap) {

         return changeToSketch(bitmap, 5,110);

      }    

     

      public static final Bitmap changeToSketch(Bitmap src,int type,int threshold) {

          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[3][3];

        for(int y = 0; y < height - 2; ++y) {

            for(int x = 0; x < width - 2; ++x) {

           //      get pixel matrix

                      for(int i = 0; i < 3; ++i) {

                    for(int j = 0; j < 3; ++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;

                sumR = (type*Color.red(pixels[1][1])) - Color.red(pixels[0][0]) - Color.red(pixels[0][2]) - Color.red(pixels[2][0]) - Color.red(pixels[2][2]);

                sumG = (type*Color.green(pixels[1][1])) - Color.green(pixels[0][0]) - Color.green(pixels[0][2]) - Color.green(pixels[2][0]) - Color.green(pixels[2][2]);

                sumB = (type*Color.blue(pixels[1][1])) - Color.blue(pixels[0][0]) - Color.blue(pixels[0][2]) - Color.blue(pixels[2][0]) - Color.blue(pixels[2][2]);

                // get final Red

                R = (int)(sumR  + threshold);

                if(R < 0) { R = 0; }

                else if(R > 255) { R = 255; }

                // get final Green

                G = (int)(sumG  + threshold);

                if(G < 0) { G = 0; }

                else if(G > 255) { G = 255; }

                // get final Blue

                B = (int)(sumB  + threshold);

                if(B < 0) { B = 0; }

                else if(B > 255) { B = 255; }

                result.setPixel(x + 1, y + 1, Color.argb(A, R, G, B));

            }

        }

        return result;

      }

             

}

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