diff --git a/nodes/testpattern/main.cpp b/nodes/testpattern/main.cpp
index 5752a5d..954620d 100644
--- a/nodes/testpattern/main.cpp
+++ b/nodes/testpattern/main.cpp
@@ -30,9 +30,11 @@ class TestPatternNode : public dmf::NodeBase {
             return;
         }
 
-        const uint32_t stride = cfg_info.discrete.sliceSizes[0];
-        log("stride=%u B/line  grain=%u B  ring=%u grains",
-            stride, stride * static_cast<uint32_t>(height), cfg_info.discrete.grainCount);
+        const uint32_t stride  = cfg_info.discrete.sliceSizes[0];
+        const auto     pattern = config().value("pattern", "bars");
+        log("stride=%u B/line  grain=%u B  ring=%u grains  pattern=%s",
+            stride, stride * static_cast<uint32_t>(height), cfg_info.discrete.grainCount,
+            pattern.c_str());
 
         const mxlRational rate  = {fps_num, fps_den};
         uint64_t          index = mxlGetCurrentIndex(&rate);
@@ -49,7 +51,11 @@ class TestPatternNode : public dmf::NodeBase {
                 continue;
             }
 
-            dmf::v210::fill_frame(buf, width, height, stride);
+            if      (pattern == "bars")  dmf::v210::fill_colorbars(buf, width, height, stride);
+            else if (pattern == "ire")   dmf::v210::fill_ire_ramp (buf, width, height, stride);
+            else if (pattern == "black") dmf::v210::fill_black     (buf, width, height, stride);
+            else if (pattern == "white") dmf::v210::fill_white     (buf, width, height, stride);
+            else                         dmf::v210::fill_colorbars (buf, width, height, stride);
             grain.flags      = 0;
             grain.validSlices = grain.totalSlices;  // mark grain complete so readers can consume it
             mxlFlowWriterCommitGrain(writer, &grain);
diff --git a/shared/V210.hpp b/shared/V210.hpp
index e3e9fd4..4dc48c5 100644
--- a/shared/V210.hpp
+++ b/shared/V210.hpp
@@ -2,6 +2,7 @@
 #include <array>
 #include <cstddef>
 #include <cstdint>
+#include <cstring>
 
 namespace dmf::v210 {
 
@@ -82,12 +83,67 @@ inline void write_bar_line(uint8_t* line, int width, uint32_t /*stride*/)
     }
 }
 
-// Fill an entire frame buffer with color bars.
+// Write one horizontal line of an arbitrary bar palette.
+template<std::size_t N>
+inline void write_palette_line(uint8_t* line, int width, const std::array<Color, N>& palette)
+{
+    const int n = static_cast<int>(N);
+    const int blocks = width / 6;
+    for (int b = 0; b < blocks; b++) {
+        int x = b * 6;
+        auto color = [&](int px) -> const Color& {
+            return palette[static_cast<std::size_t>(px * n / width)];
+        };
+        const Color& c01 = color(x);
+        const Color& c23 = color(x + 2);
+        const Color& c45 = color(x + 4);
+        pack_block(line + b * 16,
+            c01, c01.y, color(x+1).y,
+            c23, c23.y, color(x+3).y,
+            c45, c45.y, color(x+5).y);
+    }
+}
+
+// Fill a frame with a solid color.
+inline void fill_solid(uint8_t* buf, int width, int height, uint32_t stride, Color c)
+{
+    const int blocks = width / 6;
+    for (int b = 0; b < blocks; b++)
+        pack_block(buf + b * 16, c, c.y, c.y, c, c.y, c.y, c, c.y, c.y);
+    for (int y = 1; y < height; y++)
+        std::memcpy(buf + static_cast<ptrdiff_t>(y) * stride, buf, blocks * 16);
+}
+
+// SMPTE 75% color bars.
+inline void fill_colorbars(uint8_t* buf, int width, int height, uint32_t stride)
+{
+    for (int y = 0; y < height; y++)
+        write_palette_line(buf + static_cast<ptrdiff_t>(y) * stride, width, SMPTE_BARS);
+}
+
+// IRE 11-step greyscale ramp.
+inline void fill_ire_ramp(uint8_t* buf, int width, int height, uint32_t stride)
+{
+    for (int y = 0; y < height; y++)
+        write_palette_line(buf + static_cast<ptrdiff_t>(y) * stride, width, IRE_BARS);
+}
+
+// 10-bit limited black  (Y=64,  Cb=Cr=512).
+inline void fill_black(uint8_t* buf, int width, int height, uint32_t stride)
+{
+    fill_solid(buf, width, height, stride, {64, 512, 512});
+}
+
+// 10-bit limited white  (Y=940, Cb=Cr=512).
+inline void fill_white(uint8_t* buf, int width, int height, uint32_t stride)
+{
+    fill_solid(buf, width, height, stride, {940, 512, 512});
+}
+
+// Kept for backward compatibility.
 inline void fill_frame(uint8_t* buf, int width, int height, uint32_t stride)
 {
-    for (int y = 0; y < height; y++) {
-        write_bar_line(buf + static_cast<ptrdiff_t>(y) * stride, width, stride);
-    }
+    fill_colorbars(buf, width, height, stride);
 }
 
 inline void UYVYtoV210(uint8_t* src_buf, uint8_t* dst_buf, int width, int height, uint32_t src_stride, uint32_t dst_stride)
diff --git a/studio-manager/main.cpp b/studio-manager/main.cpp
index 43cc912..582ff64 100644
--- a/studio-manager/main.cpp
+++ b/studio-manager/main.cpp
@@ -41,9 +41,10 @@ static dmf::FlowGraph build_graph() {
     const std::string video_flow = gen_uuid();
     const std::string audio_flow = gen_uuid();
     g.nodes = {
-        { "ndiin",    "ndiin",    {} },
-        { "fakesink", "fakesink", {} },
-        { "ndiout",   "ndiout",   {} },
+        { "testpattern", "testpattern", {{"pattern", "bars"}} },
+        { "ndiin",       "ndiin",       {} },
+        { "fakesink",    "fakesink",    {} },
+        { "ndiout",      "ndiout",      {} },
     };
     const nlohmann::json video_fmt = {
         {"kind","video"}, {"width",1920}, {"height",1080}, {"fps_num",25}, {"fps_den",1}