FIX: Signed spacing for segmentation output

app/GenericRegionMerging.cxx

@@ -165,7 +165,7 @@ namespace otb
 					// Set output image projection, origin and spacing for labelImage
 					labelImage->SetProjectionRef(image->GetProjectionRef());
 					labelImage->SetOrigin(image->GetOrigin());
-					labelImage->SetSpacing(image->GetSpacing());
+					labelImage->SetSignedSpacing(image->GetSignedSpacing());
 					SetParameterOutputImage<LabelImageType>("out", labelImage);
 				}
 		};