diff --git a/ImGuiVisitor.cpp b/ImGuiVisitor.cpp
index de7e0fd..cced38d 100644
--- a/ImGuiVisitor.cpp
+++ b/ImGuiVisitor.cpp
@@ -150,8 +150,8 @@ void ImGuiVisitor::visit(Shader &n)
         n.color = glm::vec4(1.f, 1.f, 1.f, 1.f);
     }
     ImGui::SameLine(0, 10);
-    ImGui::ColorEdit3("Color", glm::value_ptr(n.color), ImGuiColorEditFlags_NoInputs | ImGuiColorEditFlags_NoLabel ) ;
-    ImGui::SameLine(0, 5);
+//    ImGui::ColorEdit3("Color", glm::value_ptr(n.color), ImGuiColorEditFlags_NoInputs | ImGuiColorEditFlags_NoLabel ) ;
+//    ImGui::SameLine(0, 5);
     ImGui::SetNextItemWidth(IMGUI_RIGHT_ALIGN);
     int mode = n.blending;
     if (ImGui::Combo("Blending", &mode, "Normal\0Screen\0Inverse\0Addition\0Subtract\0") )
@@ -187,6 +187,17 @@ void ImGuiVisitor::visit(ImageProcessingShader &n)
 {
     ImGui::PushID(n.id());
 
+    if (ImGuiToolkit::ButtonIcon(4, 0)) n.gamma = glm::vec4(1.f, 1.f, 1.f, 1.f);
+    float g[3] = { n.gamma.x, n.gamma.y, n.gamma.z};
+    ImGui::SameLine(0, 10);
+    ImGui::SetNextItemWidth(IMGUI_RIGHT_ALIGN);
+    if ( ImGui::SliderFloat3("RGB", g, 1.0, 10.0) )
+    {
+        n.gamma.x = g[0];
+        n.gamma.y = g[1];
+        n.gamma.z = g[2];
+    }
+
     if (ImGuiToolkit::ButtonIcon(4, 1)) {
         n.brightness = 0.f;
         n.contrast = 0.f;
@@ -205,6 +216,7 @@ void ImGuiVisitor::visit(ImageProcessingShader &n)
     ImGui::SetNextItemWidth(IMGUI_RIGHT_ALIGN);
     ImGui::SliderFloat("Saturation", &n.saturation, -1.0, 1.0);
 
+
     if (ImGuiToolkit::ButtonIcon(12, 4)) n.hueshift = 0.f;
     ImGui::SameLine(0, 10);
     ImGui::SetNextItemWidth(IMGUI_RIGHT_ALIGN);
diff --git a/Shader.cpp b/Shader.cpp
index 303dc98..bdabd16 100644
--- a/Shader.cpp
+++ b/Shader.cpp
@@ -173,7 +173,7 @@ void ShadingProgram::checkLinkingErr()
 Shader::Shader() : blending(BLEND_OPACITY)
 {
     // create unique id
-    auto duration = std::chrono::system_clock::now().time_since_epoch();
+    auto duration = std::chrono::high_resolution_clock::now().time_since_epoch();
     id_ = std::chrono::duration_cast<std::chrono::nanoseconds>(duration).count() % 100000000;
 
     program_ = &simpleShadingProgram;
@@ -204,11 +204,11 @@ void Shader::use()
     // Blending Function
     if ( blending != BLEND_CUSTOM) {
         glEnable(GL_BLEND);
-//        glBlendEquation(blending_equation[blending]);
-//        glBlendFunc(blending_source_function[blending], blending_destination_function[blending]);
+        glBlendEquation(blending_equation[blending]);
+        glBlendFunc(blending_source_function[blending], blending_destination_function[blending]);
 
-        glBlendEquationSeparate(blending_equation[blending], GL_MAX);
-        glBlendFuncSeparate(blending_source_function[blending], blending_destination_function[blending], GL_ONE_MINUS_SRC_ALPHA, GL_ZERO);
+//        glBlendEquationSeparate(blending_equation[blending], GL_FUNC_ADD);
+//        glBlendFuncSeparate(blending_source_function[blending], blending_destination_function[blending], GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 
     }
     else
diff --git a/Source.cpp b/Source.cpp
index f626fd0..e757f08 100644
--- a/Source.cpp
+++ b/Source.cpp
@@ -44,11 +44,9 @@ Source::Source() : initialized_(false), need_update_(true)
     frame->translation_.z = 0.1;
     frame->color = glm::vec4( COLOR_HIGHLIGHT_SOURCE, 1.f);
     overlays_[View::MIXING]->attach(frame);
-
     Icon *center = new Icon(Icon::GENERIC);
     center->translation_.z = 0.1;
     overlays_[View::MIXING]->attach(center);
-
     groups_[View::MIXING]->attach(overlays_[View::MIXING]);
 
     // default geometry nodes
diff --git a/rsc/shaders/image.fs b/rsc/shaders/image.fs
index 947ac15..5cefa63 100644
--- a/rsc/shaders/image.fs
+++ b/rsc/shaders/image.fs
@@ -23,7 +23,7 @@ void main()
     float maskIntensity = (maskColor.r + maskColor.g + maskColor.b) / 3.0;
 
     float A = textureColor.a * vertexColor.a * color.a * maskIntensity;
-    A *= int(gl_FragCoord.x + gl_FragCoord.y) % 2 > (1 - int(stipple)) ? 0.0 : 1.0;
+    A *= int(gl_FragCoord.x + gl_FragCoord.y) % 2 > (1 - int(stipple)) ? 0.0 : 0.8;
 
     // output RGBA
     FragColor = vec4(RGB, A);