diff --git a/test.py b/test.py
new file mode 100644
index 0000000..25951e6
--- /dev/null
+++ b/test.py
@@ -0,0 +1,27 @@
+import numpy as np
+from PIL import Image
+from kyupy import vcd
+
+def var_filter(var):
+    #print(var.scope.path)
+    return var.scope.path.endswith('picorv32_core')
+
+def step_filter(time, values, var_map):
+    #print(time)
+    return time is not None and time > 1000000000 and (time % 10000) == 0 and time <= 1600000000
+#(time % 100000) == 0
+
+_palette = np.full(8, 128, dtype=np.uint8)
+_palette[0] = 0    # black
+_palette[3] = 255  # white
+
+def to_image(data: np.ndarray, path: str):
+    pixels = _palette[data]
+    Image.fromarray(pixels, mode='L').save(path)
+
+def main():
+    vcddata = vcd.load('tests/testbench.vcd', var_filter=var_filter, step_filter=step_filter)
+    to_image(vcddata.data, 'out.png')
+
+if __name__ == "__main__":
+    main()
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