diff --git a/misc/nes-color-decoder-alt.slang b/misc/nes-color-decoder-alt.slang
index 01c1ab6..fe182fd 100644
--- a/misc/nes-color-decoder-alt.slang
+++ b/misc/nes-color-decoder-alt.slang
@@ -58,6 +58,9 @@ vec3 MakeRGBColor(int emphasis, int level, int color)
    float g = 0.0;
    float b = 0.0;
 
+   // Color 0xE and 0xF are black
+   level = (color < 14) ? level : 1;
+
    // Voltage levels, relative to synch voltage
    float black = 0.518;
    float white = 1.962;
diff --git a/misc/nes-color-decoder-sony.slang b/misc/nes-color-decoder-sony.slang
index 6b1d404..e121e70 100644
--- a/misc/nes-color-decoder-sony.slang
+++ b/misc/nes-color-decoder-sony.slang
@@ -58,6 +58,9 @@ vec3 MakeRGBColor(int emphasis, int level, int color)
    float g = 0.0;
    float b = 0.0;
 
+   // Color 0xE and 0xF are black
+   level = (color < 14) ? level : 1;
+
    // Voltage levels, relative to synch voltage
    float black = 0.518;
    float white = 1.962;
diff --git a/misc/nes-color-decoder.slang b/misc/nes-color-decoder.slang
index 6e3ae4f..1e61963 100644
--- a/misc/nes-color-decoder.slang
+++ b/misc/nes-color-decoder.slang
@@ -58,6 +58,9 @@ vec3 MakeRGBColor(int emphasis, int level, int color)
    float g = 0.0;
    float b = 0.0;
 
+   // Color 0xE and 0xF are black
+   level = (color < 14) ? level : 1;
+
    // Voltage levels, relative to synch voltage
    float black = 0.518;
    float white = 1.962;