diff --git a/src/rail/pipelines/degradation/truth_to_observed.py b/src/rail/pipelines/degradation/truth_to_observed.py
new file mode 100644
index 0000000..a6708f2
--- /dev/null
+++ b/src/rail/pipelines/degradation/truth_to_observed.py
@@ -0,0 +1,83 @@
+#!/usr/bin/env python
+# coding: utf-8
+
+# Prerquisites, os, and numpy
+import os
+import numpy as np
+
+# Various rail modules
+from rail.tools.photometry_tools import Dereddener, Reddener
+
+from rail.core.stage import RailStage, RailPipeline
+
+import ceci
+
+from rail.core.utils import RAILDIR
+
+from rail.creation.degraders.unrec_bl_model import UnrecBlModel
+
+from .spectroscopic_selection_pipeline import SELECTORS, CommonConfigParams
+from .apply_phot_errors import ERROR_MODELS
+
+
+if 'PZ_DUSTMAP_DIR' not in os.environ:  # pragma: no cover
+    os.environ['PZ_DUSTMAP_DIR'] = '.'
+
+dustmap_dir = os.path.expandvars("${PZ_DUSTMAP_DIR}")
+
+
+class TruthToObservedPipeline(RailPipeline):
+
+    default_input_dict = dict(input='dummy.in')
+
+    def __init__(self, error_models=None, selectors=None, blending=False):
+        RailPipeline.__init__(self)
+
+        DS = RailStage.data_store
+        DS.__class__.allow_overwrite = True
+
+        if error_models is None:
+            error_models = ERROR_MODELS.copy()
+
+        if selectors is None:
+            selectors = SELECTORS.copy()
+
+        config_pars = CommonConfigParams.copy()
+
+        self.reddener = Reddener.build(
+            dustmap_dir=dustmap_dir,
+            copy_all_cols=True,
+        )
+        previous_stage = self.reddener
+
+        if blending:
+            self.unrec_bl = UnrecBlModel.build()
+            previous_stage = self.unrec_bl
+
+        for key, val in error_models.items():
+            error_model_class = ceci.PipelineStage.get_stage(val['ErrorModel'], val['Module'])
+            the_error_model = error_model_class.make_and_connect(
+                name=f'error_model_{key}',
+                connections=dict(input=previous_stage.io.output),
+                hdf5_groupname='',
+            )
+            self.add_stage(the_error_model)
+            previous_stage = the_error_model
+
+            dereddener_errors = Dereddener.make_and_connect(
+                name=f"deredden_{key}",
+                dustmap_dir=dustmap_dir,
+                connections=dict(input=previous_stage.io.output),
+                copy_all_cols=True,
+            )
+            self.add_stage(dereddener_errors)
+            previous_stage = dereddener_errors
+            
+            for key2, val2 in selectors.items():
+                the_class = ceci.PipelineStage.get_stage(val2['Select'], val2['Module'])
+                the_selector = the_class.make_and_connect(
+                    name=f'select_{key}_{key2}',
+                    connections=dict(input=previous_stage.io.output),
+                    **config_pars,
+                )            
+                self.add_stage(the_selector)
diff --git a/tests/astro_tools/test_pipline.py b/tests/astro_tools/test_pipline.py
index 75efe47..61c9910 100644
--- a/tests/astro_tools/test_pipline.py
+++ b/tests/astro_tools/test_pipline.py
@@ -4,13 +4,14 @@
 import pytest
 
 @pytest.mark.parametrize(
-    "pipeline_class",
+    "pipeline_class, options",
     [
-        'rail.pipelines.degradation.apply_phot_errors.ApplyPhotErrorsPipeline',
-        'rail.pipelines.degradation.blending.BlendingPipeline',
-        'rail.pipelines.degradation.spectroscopic_selection_pipeline.SpectroscopicSelectionPipeline',
+        ('rail.pipelines.degradation.apply_phot_errors.ApplyPhotErrorsPipeline', {}),
+        ('rail.pipelines.degradation.blending.BlendingPipeline', {}),
+        ('rail.pipelines.degradation.spectroscopic_selection_pipeline.SpectroscopicSelectionPipeline', {}),
+        ('rail.pipelines.degradation.truth_to_observed.TruthToObservedPipeline', {'blending':True}),
     ]
 )
-def test_build_and_read_pipeline(pipeline_class):
-    build_and_read_pipeline(pipeline_class)
+def test_build_and_read_pipeline(pipeline_class, options):
+    build_and_read_pipeline(pipeline_class, **options)