How To Convert An Image Into Tattoo?

Am working the app for tattoolater in that i required to convert an image(which is taken from camera or selected from gallery)into tattoo... my requirement is like the following

Solution 1:

you need a difference filter:

1) you calc the horizontal difference (here you'll have vertical segments)

2) you calc the vertical difference (here, horizontal segments)

3) you OR the two maps, finding the outlines

4) recreate a Bitmap object, if you wish to do so

something like (EDITED):

int[] pixels;
int width = yourbitmap.getWidth();
int height = yourbitmap.getHeight();
yourbitmap.getPixels(pixels, 0, width, 0, 0, width, height);

// transform grayscaleint[] image = newint[width*height];
for (int y=0; y<height; y++)
    for (int x=0; x<width; x++)
    {
        int pixel = image[y*width + x];
        image[y*width + x] = (Color.red(pixel) + Color.green(pixel) + Color.blue(pixel))/3;
    }

// calculate diff_x (vertical segments)int[] dx = newint[width*height];

for (int y=0; y<height; y++)
    for (int x=0; x<width; x++)
        dx[y*width + x] = (x==0 || y== 0 ? 0 : Math.abs(image[y*width + x] - image[y*width + x-1]));

// calculate diff_y (horizontal segments)int[] dy = newint[width*height];

for (int y=0; y<height; y++)
    for (int x=0; x<width; x++)
        dy[y*width + x] = (x==0 || y== 0 ? 0 : Math.abs(image[y*width+x] - image[(y-1)*width+x])); 


// when the color intensity is higher than THRESHOLD, accept segment// you'll want a slider to change THRESHOLD valuesbool[] result = newbool[width*height];
constint THRESHOLD = 60; // adjust this valuefor (int y=0; y<height; y++)
    for (int x=0; x<width; x++)
        result[y*width + x] = (dx[y*width + x] > THRESHOLD || dy[y*width + x] > THRESHOLD);

Bitmap result = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
for (int y=0; y<height; y++)
    for (int x=0; x<width; x++)
               result.setPixel(x, y, result[y*width+x]? Color.Black : Color.White);

Solution 2:

You can use this:

publicstatic Bitmap ConvertToBlackAndWhite(Bitmap sampleBitmap) {
        ColorMatrixbwMatrix=newColorMatrix();
        bwMatrix.setSaturation(0);
        finalColorMatrixColorFiltercolorFilter=newColorMatrixColorFilter(
                bwMatrix);
        BitmaprBitmap= sampleBitmap.copy(Bitmap.Config.ARGB_8888, true);
        Paintpaint=newPaint();
        paint.setColorFilter(colorFilter);
        CanvasmyCanvas=newCanvas(rBitmap);
        myCanvas.drawBitmap(rBitmap, 0, 0, paint);
        return doBlackWhiteImage(rBitmap);
    }

publicstatic BlackWhiteImage doBlackWhiteImage(Bitmap myBitmap) {
        int[] allpixels = newint[myBitmap.getHeight() * myBitmap.getWidth()];
        myBitmap.getPixels(allpixels, 0, myBitmap.getWidth(), 0, 0,
                myBitmap.getWidth(), myBitmap.getHeight());
        for (inti=0; i < myBitmap.getHeight() * myBitmap.getWidth(); i++) {
            if (allpixels[i] == Color.BLACK)
                // do somethingelseif (allpixels[i] == Color.TRANSPARENT)
                // do somethingelseif (allpixels[i] == Color.WHITE)
                // do somethingelse {
                allpixels[i] = Color.WHITE;
            }
        }
        myBitmap.setPixels(allpixels, 0, myBitmap.getWidth(), 0, 0,
                myBitmap.getWidth(), myBitmap.getHeight());
        return myBitmap;
    }