Larger Image Overlays on Android

I'm attempting to overlay one image on an image taken by the device camera and save the result back to external storage. I'm continually running into:

java.lang.OutOfMemoryError: bitmap size exceeds VM budget

which I generally understand but in this case I cannot downsample the image from the camera because I want to preserve the original quality. The camera image is 2592x1456. The overlay image is 490x834. It seems that at a minimum I'll have to:

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.os.Bundle;

public class TestActivity extends Activity {

    private Bitmap overlay;
    private Bitmap base;
    private Bitmap background;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        base = BitmapFactory.decodeResource(getResources(), R.drawable.base);
        overlay = BitmapFactory.decodeResource(getResources(), R.drawable.overlay);             
        background = BitmapFactory.decodeResouce(getResources(), R.drawable.background);
    }

    @Override
    protected void onStart() {
        Rect target = new Rect(0, 0, 490, 834);

        Canvas canvas = new Canvas(base);
        canvas.drawBitmap(overlay, null, target, null);

        super.onStart();
    }

}

And I'd like to do this while a view is presenting some background. I tried to simulate it by loading the three images in question. If I comment out the background then it works. In this case the background is a downsampled version of base...

Am I missing something obvious in terms of accomplishing this?

Is there a way to perform the overlay in a streaming fashion so the memory is not exhausted?

ansaurus

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Larger Image Overlays on Android

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