diff --git a/ADMM.py b/ADMM.py
index f38d524..1ac9ca7 100755
--- a/ADMM.py
+++ b/ADMM.py
@@ -5,9 +5,9 @@
 import yaml
 
 def loadData(show_im=True):
-    psf = Image.open(psfname)
+    psf = Image.open(psfname).convert('L')
     psf = np.array(psf, dtype='float32')
-    data = Image.open(imgname)
+    data = Image.open(imgname).convert('L')
     data = np.array(data, dtype='float32')
     
     """In the picamera, there is a non-trivial background 
diff --git a/GD.py b/GD.py
index d23628c..f0d4da8 100755
--- a/GD.py
+++ b/GD.py
@@ -7,9 +7,9 @@
 
 
 def loaddata(show_im=True):
-    psf = Image.open(psfname)
+    psf = Image.open(psfname).convert('L')
     psf = np.array(psf, dtype='float32')
-    data = Image.open(imgname)
+    data = Image.open(imgname).convert('L')
     data = np.array(data, dtype='float32')
     
     """In the picamera, there is a non-trivial background 
diff --git a/tutorial/ADMM.ipynb b/tutorial/ADMM.ipynb
index fb63887..cc8f8a4 100644
--- a/tutorial/ADMM.ipynb
+++ b/tutorial/ADMM.ipynb
@@ -95,9 +95,9 @@
    "outputs": [],
    "source": [
     "def loadData(show_im=True):\n",
-    "    psf = Image.open(psfname)\n",
+    "    psf = Image.open(psfname).convert('L')\n",
     "    psf = np.array(psf, dtype='float32')\n",
-    "    data = Image.open(imgname)\n",
+    "    data = Image.open(imgname).convert('L')\n",
     "    data = np.array(data, dtype='float32')\n",
     "    \n",
     "    \"\"\"In the picamera, there is a non-trivial background \n",
diff --git a/tutorial/GD.ipynb b/tutorial/GD.ipynb
index 9b0bdf6..28da63d 100644
--- a/tutorial/GD.ipynb
+++ b/tutorial/GD.ipynb
@@ -92,9 +92,9 @@
    "outputs": [],
    "source": [
     "def loaddata(show_im=True):\n",
-    "    psf = Image.open(psfname)\n",
+    "    psf = Image.open(psfname).convert('L')\n",
     "    psf = np.array(psf, dtype='float32')\n",
-    "    data = Image.open(imgname)\n",
+    "    data = Image.open(imgname).convert('L')\n",
     "    data = np.array(data, dtype='float32')\n",
     "    \n",
     "    \"\"\"In the picamera, there is a non-trivial background \n",