diff --git a/src/gl/renderer/gl_postprocess.cpp b/src/gl/renderer/gl_postprocess.cpp
index 43f7458eb..a19e90ef1 100644
--- a/src/gl/renderer/gl_postprocess.cpp
+++ b/src/gl/renderer/gl_postprocess.cpp
@@ -601,7 +601,8 @@ void FGLRenderer::CreateTonemapPalette()
 			{
 				for (int b = 0; b < 64; b++)
 				{
-					PalEntry color = GPalette.BaseColors[(uint8_t)PTM_BestColor((uint32_t *)GPalette.BaseColors, (r << 2) | (r >> 4), (g << 2) | (g >> 4), (b << 2) | (b >> 4), 0, 256)];
+					PalEntry color = GPalette.BaseColors[(uint8_t)PTM_BestColor((uint32_t *)GPalette.BaseColors, (r << 2) | (r >> 4), (g << 2) | (g >> 4), (b << 2) | (b >> 4), 
+						gl_paltonemap_reverselookup, gl_paltonemap_powtable, 0, 256)];
 					int index = ((r * 64 + g) * 64 + b) * 4;
 					lut[index] = color.b;
 					lut[index + 1] = color.g;
@@ -914,41 +915,3 @@ void FGLRenderer::ClearBorders()
 	glDisable(GL_SCISSOR_TEST);
 }
 
-
-// [SP] Re-implemented BestColor for more precision rather than speed. This function is only ever called once until the game palette is changed.
-
-int FGLRenderer::PTM_BestColor (const uint32_t *pal_in, int r, int g, int b, int first, int num)
-{
-	const PalEntry *pal = (const PalEntry *)pal_in;
-	static double powtable[256];
-	static bool firstTime = true;
-	static float trackpowtable = 0.;
-
-	double fbestdist = DBL_MAX, fdist;
-	int bestcolor = 0;
-
-	if (firstTime || trackpowtable != gl_paltonemap_powtable)
-	{
-		trackpowtable = gl_paltonemap_powtable;
-		firstTime = false;
-		for (int x = 0; x < 256; x++) powtable[x] = pow((double)x/255, (double)gl_paltonemap_powtable);
-	}
-
-	for (int color = first; color < num; color++)
-	{
-		double x = powtable[abs(r-pal[color].r)];
-		double y = powtable[abs(g-pal[color].g)];
-		double z = powtable[abs(b-pal[color].b)];
-		fdist = x + y + z;
-		if (color == first || ((gl_paltonemap_reverselookup)?(fdist <= fbestdist):(fdist < fbestdist)))
-		{
-			if (fdist == 0 && !gl_paltonemap_reverselookup)
-				return color;
-
-			fbestdist = fdist;
-			bestcolor = color;
-		}
-	}
-	return bestcolor;
-}
-
diff --git a/src/gl/renderer/gl_renderer.h b/src/gl/renderer/gl_renderer.h
index ae908523c..19f58836d 100644
--- a/src/gl/renderer/gl_renderer.h
+++ b/src/gl/renderer/gl_renderer.h
@@ -202,8 +202,6 @@ public:
 		double originx, double originy, double scalex, double scaley,
 		DAngle rotation, const FColormap &colormap, PalEntry flatcolor, int lightlevel, int bottomclip);
 
-	int PTM_BestColor (const uint32_t *pal_in, int r, int g, int b, int first, int num);
-
 	static float GetZNear() { return 5.f; }
 	static float GetZFar() { return 65536.f; }
 };
diff --git a/src/v_palette.cpp b/src/v_palette.cpp
index 6d1114f91..a836da1ed 100644
--- a/src/v_palette.cpp
+++ b/src/v_palette.cpp
@@ -121,6 +121,48 @@ int BestColor (const uint32_t *pal_in, int r, int g, int b, int first, int num)
 	return bestcolor;
 }
 
+
+// [SP] Re-implemented BestColor for more precision rather than speed. This function is only ever called once until the game palette is changed.
+
+int PTM_BestColor (const uint32_t *pal_in, int r, int g, int b, bool reverselookup, float powtable_val, int first, int num)
+{
+	const PalEntry *pal = (const PalEntry *)pal_in;
+	static double powtable[256];
+	static bool firstTime = true;
+	static float trackpowtable = 0.;
+
+	double fbestdist = DBL_MAX, fdist;
+	int bestcolor = 0;
+
+	if (firstTime || trackpowtable != powtable_val)
+	{
+		auto pt = powtable_val;
+		trackpowtable = pt;
+		firstTime = false;
+		for (int x = 0; x < 256; x++) powtable[x] = pow((double)x/255, (double)pt);
+	}
+
+	for (int color = first; color < num; color++)
+	{
+		double x = powtable[abs(r-pal[color].r)];
+		double y = powtable[abs(g-pal[color].g)];
+		double z = powtable[abs(b-pal[color].b)];
+		fdist = x + y + z;
+		if (color == first || (reverselookup?(fdist <= fbestdist):(fdist < fbestdist)))
+		{
+			if (fdist == 0 && !reverselookup)
+				return color;
+
+			fbestdist = fdist;
+			bestcolor = color;
+		}
+	}
+	return bestcolor;
+}
+
+
+
+
 FPalette::FPalette ()
 {
 }
diff --git a/src/v_palette.h b/src/v_palette.h
index 3f8f00039..a9a7e476b 100644
--- a/src/v_palette.h
+++ b/src/v_palette.h
@@ -71,6 +71,7 @@ extern FPalette GPalette;
 #define DIM_OVERLAY MAKEARGB(170,0,0,0)
 
 int BestColor (const uint32_t *pal, int r, int g, int b, int first=1, int num=255);
+int PTM_BestColor (const uint32_t *pal_in, int r, int g, int b, bool reverselookup, float powtable, int first=1, int num=255);
 void DoBlending (const PalEntry *from, PalEntry *to, int count, int r, int g, int b, int a);
 
 void ReadPalette(int lumpnum, uint8_t *buffer);