diff --git a/include/fused_kernel/algorithms/image_processing/color_conversion.h b/include/fused_kernel/algorithms/image_processing/color_conversion.h
index 691969a9..bee1a556 100644
--- a/include/fused_kernel/algorithms/image_processing/color_conversion.h
+++ b/include/fused_kernel/algorithms/image_processing/color_conversion.h
@@ -88,7 +88,7 @@ namespace fk {
         DECLARE_UNARY_PARENT
         FK_HOST_DEVICE_FUSE OutputType exec(const InputType input) {
             constexpr auto alpha = maxDepthValue<CD>;
-            return AddLast<InputType, OutputType>::exec(input, { alpha });
+            return AddLast<InputType, OutputType>::exec(input, { static_cast<VBase<I>>(alpha) });
         }
     };
 
@@ -147,37 +147,28 @@ namespace fk {
         }
     };
 
-    template <ColorDepth CD, ColorRange CR, ColorPrimitives CP, bool ALPHA>
+    template <ColorDepth CD, ColorRange CR, ColorPrimitives CP>
     struct ConvertYUVToRGB {
     private:
-        using SelfType = ConvertYUVToRGB<CD, CR, CP, ALPHA>;
-        using Parent = UnaryOperation<ColorDepthPixelType<CD, ALPHA>, ColorDepthPixelType<CD, ALPHA>, ConvertYUVToRGB<CD, CR, CP, ALPHA>>;
+        using SelfType = ConvertYUVToRGB<CD, CR, CP>;
+        using Parent = UnaryOperation<ColorDepthPixelType<CD>, float3, SelfType >;
     public:
         FK_STATIC_STRUCT(ConvertYUVToRGB, SelfType)
         DECLARE_UNARY_PARENT
-
-        private:
         // Y     -> input.x
         // Cb(U) -> input.y
         // Cr(V) -> input.z
-        FK_HOST_DEVICE_FUSE float3 computeRGB(const InputType pixel) {
+        public:
+        FK_HOST_DEVICE_FUSE OutputType exec(const InputType input) {
             constexpr M3x3Float coefficients = ccMatrix<CR, CP, ColorConversionDir::YCbCr2RGB, CD>;
             constexpr float CSub = subCoefficients<CD>.chroma;
             if constexpr (CR == ColorRange::Limited) {
                 constexpr float YSub = subCoefficients<CD>.luma;
-                return MxVFloat3<UnaryType>::exec({ make_<float3>(pixel.x - YSub, pixel.y - CSub, pixel.z - CSub), coefficients });
-            } else {
-                return MxVFloat3<UnaryType>::exec({ make_<float3>(pixel.x,        pixel.y - CSub, pixel.z - CSub), coefficients });
-            }
-        }
-
-        public:
-        FK_HOST_DEVICE_FUSE OutputType exec(const InputType input) {
-            const float3 pixelRGBFloat = computeRGB(input);
-            if constexpr (ALPHA) {
-                return float4{pixelRGBFloat.x, pixelRGBFloat.y, pixelRGBFloat.z, input.w};
+                return MxVFloat3<UnaryType>::exec(
+                    {make_<float3>(input.x - YSub, input.y - CSub, input.z - CSub), coefficients});
             } else {
-                return pixelRGBFloat;
+                return MxVFloat3<UnaryType>::exec(
+                    {make_<float3>(input.x,        input.y - CSub, input.z - CSub), coefficients});
             }
         }
     };
@@ -195,7 +186,7 @@ namespace fk {
         using PixelBaseType = ColorDepthPixelBaseType<PixelFormatTraits<PF>::depth>;
         using Parent = ReadOperation<PixelBaseType,
                                      RawImage<PF>,
-                                     ColorDepthPixelType<(ColorDepth)PixelFormatTraits<PF>::depth, false>,
+                                     ColorDepthPixelType<(ColorDepth)PixelFormatTraits<PF>::depth>,
                                      TF::DISABLED,
                                      ReadYUV<PF>>;
         DECLARE_READ_PARENT
@@ -283,7 +274,7 @@ namespace fk {
     public:
         FK_STATIC_STRUCT(WriteYUV, SelfType)
         using PixelBaseType = ColorDepthPixelBaseType<PixelFormatTraits<PF>::depth>;
-        using Parent = WriteOperation<ColorDepthPixelType<(ColorDepth)PixelFormatTraits<PF>::depth, false>,
+        using Parent = WriteOperation<ColorDepthPixelType<(ColorDepth)PixelFormatTraits<PF>::depth>,
                                       RawImage<PF>,
                                       PixelBaseType, 
                                       TF::DISABLED,
diff --git a/include/fused_kernel/algorithms/image_processing/image.h b/include/fused_kernel/algorithms/image_processing/image.h
index e9e352d2..0f3fe0df 100644
--- a/include/fused_kernel/algorithms/image_processing/image.h
+++ b/include/fused_kernel/algorithms/image_processing/image.h
@@ -17,6 +17,7 @@
 #define FK_IMAGE_H
 
 #include <fused_kernel/algorithms/image_processing/raw_image.h>
+#include <fused_kernel/algorithms/image_processing/color_conversion.h>
 #include <fused_kernel/core/data/ptr_nd.h>
 
 namespace fk {
@@ -39,7 +40,7 @@ namespace fk {
             : data(data), width(width), height(height) {}
 
         FK_HOST_CNST Image(const uint width, const uint height,
-                           const MemType& memType = defaultMemType, const uint deviceID = 0)
+                           const MemType memType = defaultMemType, const uint deviceID = 0)
             : width(width), height(height) {
             const uint dataWidth = width * PixelFormatTraits<PF>::rf.width_f;
             const uint dataHeight = height * PixelFormatTraits<PF>::rf.height_f;
diff --git a/include/fused_kernel/algorithms/image_processing/itu_color.h b/include/fused_kernel/algorithms/image_processing/itu_color.h
index 810be0f1..34daf433 100644
--- a/include/fused_kernel/algorithms/image_processing/itu_color.h
+++ b/include/fused_kernel/algorithms/image_processing/itu_color.h
@@ -38,13 +38,10 @@ namespace fk {
                  CD_t<ColorDepth::fn8bit>, CD_t<ColorDepth::fn10bit>, CD_t<ColorDepth::fn12bit>>;
     using ColorDepthPixelBaseTypes = TypeList<uchar, ushort, ushort, float, float, float>;
     using ColorDepthPixelTypes = TypeList<uchar3, ushort3, ushort3, float3, float3, float3>;
-    using ColorDepthPixelTypesAlpha = TypeList<uchar4, ushort4, ushort4, float4, float4, float4>;
     template <ColorDepth CD>
     using ColorDepthPixelBaseType = EquivalentType_t<CD_t<CD>, ColorDepthTypes, ColorDepthPixelBaseTypes>;
-    template <ColorDepth CD, bool ALPHA>
-    using ColorDepthPixelType = std::conditional_t<ALPHA,
-                                                   EquivalentType_t<CD_t<CD>, ColorDepthTypes, ColorDepthPixelTypesAlpha>,
-                                                   EquivalentType_t<CD_t<CD>, ColorDepthTypes, ColorDepthPixelTypes>>;
+    template <ColorDepth CD>
+    using ColorDepthPixelType = EquivalentType_t<CD_t<CD>, ColorDepthTypes, ColorDepthPixelTypes>;
 
     // Taking into account the color depth, the pixel base type is uchar, ushort or float
     // ResolutionFactors therefore are used to compute the number of pixel base type elements on width and height
diff --git a/include/fused_kernel/core/constexpr_libs/constexpr_vector_exec.h b/include/fused_kernel/core/constexpr_libs/constexpr_vector_exec.h
index 2baf7bc3..09721aaa 100644
--- a/include/fused_kernel/core/constexpr_libs/constexpr_vector_exec.h
+++ b/include/fused_kernel/core/constexpr_libs/constexpr_vector_exec.h
@@ -55,6 +55,14 @@ namespace cxp {
         FK_HOST_DEVICE_FUSE auto exec(const ST1& s1, const ST2& s2, const STs&... scals) {
             return exec(Op::exec(s1, s2), scals...);
         }
+        // Single scalar operand: a binary reduction over a single value is that value.
+        // This allows variadic folds (cxp::sum::f, cxp::max::f, cxp::min::f, ...) to be
+        // instantiated with parameter packs of size 1.
+        template <typename ST>
+        FK_HOST_DEVICE_FUSE auto exec(const ST& s)
+            -> std::enable_if_t<!fk::validCUDAVec<ST>, ST> {
+            return s;
+        }
         template <fk::vector_type VT>
         FK_HOST_DEVICE_FUSE auto exec(const VT& v)
             -> decltype(Op::exec(std::declval<fk::VBase<VT>>(), std::declval<fk::VBase<VT>>())) {
diff --git a/tests/buildAPI/batch_build_compilation_time.h b/tests/buildAPI/batch_build_compilation_time.h
index 0eea5b0f..afd0e32c 100644
--- a/tests/buildAPI/batch_build_compilation_time.h
+++ b/tests/buildAPI/batch_build_compilation_time.h
@@ -63,7 +63,7 @@ void testCompareReferenceVSValueVSInstantiableDPP() {
 
     // Create the operation instances once, and use them multiple times
     const auto readIOp = ReadYUV<PixelFormat::NV12>::build(inputImage);
-    const auto yuvToRGB = ConvertYUVToRGB<ColorDepth::p8bit, ColorRange::Full, ColorPrimitives::bt2020, false>::build();
+    const auto yuvToRGB = ConvertYUVToRGB<ColorDepth::p8bit, ColorRange::Full, ColorPrimitives::bt2020>::build();
     const auto borderReader = BorderReader<BorderType::REPLICATE>::build();
     const auto cropIOp = Crop<>::build(crops);
     const auto resizeIOp =
diff --git a/tests/operation/test_fused_operation.h b/tests/operation/test_fused_operation.h
index 6b540066..5203dc34 100644
--- a/tests/operation/test_fused_operation.h
+++ b/tests/operation/test_fused_operation.h
@@ -41,7 +41,7 @@ constexpr bool test_fuseDFResultingTypes() {
     static_assert(std::is_same_v<std::decay_t<decltype(readOp2)>, Read<PerThreadRead<ND::_2D, uchar3>>>, "Unexpected type after fuseIOps");
 
     constexpr auto readYUV = ReadYUV<PixelFormat::NV12>::build({ {RawPtr<ND::_2D, uchar>{nullptr, PtrDims<ND::_2D>(128, 128 + 64)}, 128, 128} });
-    constexpr auto readRGB = readYUV.then(ConvertYUVToRGB<ColorDepth::p8bit, ColorRange::Full, ColorPrimitives::bt2020, false>::build());
+    constexpr auto readRGB = readYUV.then(ConvertYUVToRGB<ColorDepth::p8bit, ColorRange::Full, ColorPrimitives::bt2020>::build());
 
     constexpr auto resizeRead = Resize<InterpolationType::INTER_LINEAR>::build(readRGB, Size(64, 64));
     constexpr auto resizeReadWithMul = resizeRead.then(Mul<float>::build(3.f));