diff --git a/ImGuiVisitor.cpp b/ImGuiVisitor.cpp
index ed82e7d..52b11d2 100644
--- a/ImGuiVisitor.cpp
+++ b/ImGuiVisitor.cpp
@@ -824,7 +824,7 @@ void ImGuiVisitor::visit (SharpenFilter& f)
     oss << "Blur ";
 
     // Method selection
-    if (ImGuiToolkit::IconButton(7, 16)) {
+    if (ImGuiToolkit::IconButton(2, 1)) {
         f.setMethod( 0 );
         oss << SharpenFilter::method_label[0];
         Action::manager().store(oss.str());
diff --git a/ImageFilter.cpp b/ImageFilter.cpp
index 3fc2623..0660f4a 100644
--- a/ImageFilter.cpp
+++ b/ImageFilter.cpp
@@ -614,6 +614,15 @@ void SharpenFilter::setMethod(int method)
     setProgram( programs_[ (int) method_] );
 }
 
+void SharpenFilter::draw (FrameBuffer *input)
+{
+    // Default
+    if (method_ == SHARPEN_INVALID)
+        setMethod( SHARPEN_MASK );
+
+    ImageFilter::draw( input );
+}
+
 void SharpenFilter::accept (Visitor& v)
 {
     FrameBufferFilter::accept(v);
diff --git a/ImageFilter.h b/ImageFilter.h
index 862d9b8..4fab3dc 100644
--- a/ImageFilter.h
+++ b/ImageFilter.h
@@ -157,6 +157,7 @@ public:
     // implementation of FrameBufferFilter
     Type type() const override { return FrameBufferFilter::FILTER_SHARPEN; }
 
+    void draw   (FrameBuffer *input) override;
     void accept (Visitor& v) override;
 
 private:
diff --git a/SessionCreator.cpp b/SessionCreator.cpp
index 0be6ff4..7409ff3 100644
--- a/SessionCreator.cpp
+++ b/SessionCreator.cpp
@@ -1249,6 +1249,30 @@ void SessionLoader::visit (BlurFilter& f)
     f.setProgramParameters(filter_params);
 }
 
+void SessionLoader::visit (SharpenFilter& f)
+{
+    int m = 0;
+    xmlCurrent_->QueryIntAttribute("method", &m);
+    f.setMethod(m);
+
+    std::map< std::string, float > filter_params;
+    XMLElement* parameters = xmlCurrent_->FirstChildElement("parameters");
+    if (parameters) {
+        XMLElement* param = parameters->FirstChildElement("uniform");
+        for( ; param ; param = param->NextSiblingElement())
+        {
+            float val = 0.f;
+            param->QueryFloatAttribute("value", &val);
+            const char * name;
+            param->QueryStringAttribute("name", &name);
+            if (name)
+                filter_params[name] = val;
+        }
+    }
+
+    f.setProgramParameters(filter_params);
+}
+
 void SessionLoader::visit (ImageFilter& f)
 {
     const char * filter_name;
diff --git a/SessionCreator.h b/SessionCreator.h
index dd4475b..16fbe0b 100644
--- a/SessionCreator.h
+++ b/SessionCreator.h
@@ -65,6 +65,7 @@ public:
     void visit (FrameBufferFilter&) override;
     void visit (DelayFilter&) override;
     void visit (BlurFilter&) override;
+    void visit (SharpenFilter&) override;
     void visit (ImageFilter&) override;
 
     // callbacks
diff --git a/SessionVisitor.cpp b/SessionVisitor.cpp
index 232feb1..8ea35ff 100644
--- a/SessionVisitor.cpp
+++ b/SessionVisitor.cpp
@@ -710,6 +710,22 @@ void SessionVisitor::visit (BlurFilter& f)
     }
 }
 
+void SessionVisitor::visit (SharpenFilter& f)
+{
+    xmlCurrent_->SetAttribute("method", (int) f.method());
+
+    std::map< std::string, float > filter_params = f.program().parameters();
+    XMLElement *parameters = xmlDoc_->NewElement( "parameters" );
+    xmlCurrent_->InsertEndChild(parameters);
+    for (auto p = filter_params.begin(); p != filter_params.end(); ++p)
+    {
+        XMLElement *param = xmlDoc_->NewElement( "uniform" );
+        param->SetAttribute("name", p->first.c_str() );
+        param->SetAttribute("value", p->second );
+        parameters->InsertEndChild(param);
+    }
+}
+
 void SessionVisitor::visit (ImageFilter& f)
 {
     xmlCurrent_->SetAttribute("name", f.program().name().c_str() );
diff --git a/SessionVisitor.h b/SessionVisitor.h
index 1fb974f..050dfc4 100644
--- a/SessionVisitor.h
+++ b/SessionVisitor.h
@@ -73,6 +73,7 @@ public:
     void visit (FrameBufferFilter&) override;
     void visit (DelayFilter&) override;
     void visit (BlurFilter&) override;
+    void visit (SharpenFilter&) override;
     void visit (ImageFilter&) override;
 
     // callbacks