diff --git a/src/main/java/spim/process/fusion/weights/Blending.java b/src/main/java/spim/process/fusion/weights/Blending.java
index f55d6ba5..c6474ebb 100644
--- a/src/main/java/spim/process/fusion/weights/Blending.java
+++ b/src/main/java/spim/process/fusion/weights/Blending.java
@@ -69,4 +69,10 @@ public RealRandomAccess<FloatType> realRandomAccess( final RealInterval interval
 	{
 		return realRandomAccess();
 	}
+
+	@Override
+	public FloatType getType()
+	{
+		return new FloatType();
+	}
 }
diff --git a/src/main/java/spim/process/fusion/weights/ContentBased.java b/src/main/java/spim/process/fusion/weights/ContentBased.java
index 1bae2e58..7b661caf 100644
--- a/src/main/java/spim/process/fusion/weights/ContentBased.java
+++ b/src/main/java/spim/process/fusion/weights/ContentBased.java
@@ -139,6 +139,12 @@ public RealRandomAccess<FloatType> realRandomAccess( final RealInterval interval
 				).realRandomAccess( interval );
 	}
 
+	@Override
+	public FloatType getType()
+	{
+		return new FloatType();
+	}
+
 	final private static Img< FloatType > createGaussianKernel( final double[] sigmas )
 	{
 		final int numDimensions = sigmas.length;
diff --git a/src/main/java/spim/process/fusion/weights/NormalizingRandomAccessibleInterval.java b/src/main/java/spim/process/fusion/weights/NormalizingRandomAccessibleInterval.java
index 59db4523..22908e3b 100644
--- a/src/main/java/spim/process/fusion/weights/NormalizingRandomAccessibleInterval.java
+++ b/src/main/java/spim/process/fusion/weights/NormalizingRandomAccessibleInterval.java
@@ -71,6 +71,12 @@ public RandomAccess< T > randomAccess()
 	@Override
 	public RandomAccess< T > randomAccess( final Interval interval ) { return randomAccess(); }
 
+	@Override
+	public T getType()
+	{
+		return type;
+	}
+
 	@Override
 	public long min( final int d ){ return interval.min( 0 ); }
 
diff --git a/src/main/java/spim/process/fusion/weights/TransformedRealRandomAccessibleInterval.java b/src/main/java/spim/process/fusion/weights/TransformedRealRandomAccessibleInterval.java
index 12916014..f91120fa 100644
--- a/src/main/java/spim/process/fusion/weights/TransformedRealRandomAccessibleInterval.java
+++ b/src/main/java/spim/process/fusion/weights/TransformedRealRandomAccessibleInterval.java
@@ -70,6 +70,12 @@ public RandomAccess< T > randomAccess()
 	@Override
 	public RandomAccess< T > randomAccess( final Interval interval ) { return randomAccess(); }
 
+	@Override
+	public T getType()
+	{
+		return zero;
+	}
+
 	@Override
 	public long min( final int d ){ return transformedInterval.min( d ); }