diff --git a/openbr/plugins/stasm4.cpp b/openbr/plugins/stasm4.cpp
index 81c3d27..2d0a1fe 100644
--- a/openbr/plugins/stasm4.cpp
+++ b/openbr/plugins/stasm4.cpp
@@ -75,8 +75,11 @@ class StasmTransform : public UntrainableTransform
 
     void project(const Template &src, Template &dst) const
     {
-        if (src.m().channels() != 1) qFatal("Stasm expects single channel matrices.");
-
+        Mat stasmSrc(src);
+        if (src.m().channels() == 3)
+            cvtColor(src, stasmSrc, CV_BGR2GRAY);
+        else if (src.m().channels() != 1)
+            qFatal("Stasm expects single channel matrices.");
         dst = src;
 
         StasmCascadeClassifier *stasmCascade = stasmCascadeResource.acquire();
@@ -117,14 +120,14 @@ class StasmTransform : public UntrainableTransform
                     else if (i == 39)  /*Stasm Left Eye*/ { eyes[2*i] = leftEye.x(); eyes[2*i+1] = leftEye.y(); }
                     else { eyes[2*i] = 0; eyes[2*i+1] = 0; }
                 }
-                stasm_search_pinned(landmarks, eyes, reinterpret_cast<const char*>(src.m().data), src.m().cols, src.m().rows, NULL);
+                stasm_search_pinned(landmarks, eyes, reinterpret_cast<const char*>(stasmSrc.data), stasmSrc.cols, stasmSrc.rows, NULL);
 
                 // The ASM in Stasm is guaranteed to converge in this case
                 foundFace = 1;
             }
         }
 
-        if (!foundFace) stasm_search_single(&foundFace, landmarks, reinterpret_cast<const char*>(src.m().data), src.m().cols, src.m().rows, *stasmCascade, NULL, NULL);
+        if (!foundFace) stasm_search_single(&foundFace, landmarks, reinterpret_cast<const char*>(stasmSrc.data), stasmSrc.cols, stasmSrc.rows, *stasmCascade, NULL, NULL);
 
         if (stasm3Format) {
             nLandmarks = 76;