diff --git a/source/core/defparser.cpp b/source/core/defparser.cpp
index 18d0a7e814b..7a55068acbb 100644
--- a/source/core/defparser.cpp
+++ b/source/core/defparser.cpp
@@ -45,8 +45,8 @@
 #include "mapinfo.h"
 #include "hw_voxels.h"
 
-int tileSetHightileReplacement(int picnum, int palnum, const char* filename, float alphacut, float xscale, float yscale, float specpower, float specfactor);
-int tileSetSkybox(int picnum, int palnum, FString* facenames);
+int tileSetHightileReplacement(int picnum, int palnum, const char* filename, float alphacut, float xscale, float yscale, float specpower, float specfactor, bool indexed = false);
+int tileSetSkybox(int picnum, int palnum, FString* facenames, bool indexed = false);
 void tileRemoveReplacement(int num);
 void AddUserMapHack(usermaphack_t&);
 
@@ -135,7 +135,8 @@ static void parseTexturePaletteBlock(FScanner& sc, int tile)
 
 	int pal = -1, xsiz = 0, ysiz = 0;
 	FString fn;
-	double alphacut = -1.0, xscale = 1.0, yscale = 1.0, specpower = 1.0, specfactor = 1.0;
+	float alphacut = -1.0, xscale = 1.0, yscale = 1.0, specpower = 1.0, specfactor = 1.0;
+	bool indexed = false;
 
 	if (!sc.GetNumber(pal, true)) return;
 
@@ -151,6 +152,7 @@ static void parseTexturePaletteBlock(FScanner& sc, int tile)
 		else if (sc.Compare({ "specfactor", "specularfactor", "parallaxbias" })) sc.GetFloat(specfactor, true);
 		else if (sc.Compare("orig_sizex")) sc.GetNumber(xsiz, true);
 		else if (sc.Compare("orig_sizey")) sc.GetNumber(ysiz, true);
+		else if (sc.Compare("indexed")) indexed = true;
 	};
 
 	if ((unsigned)tile < MAXUSERTILES)
@@ -167,7 +169,7 @@ static void parseTexturePaletteBlock(FScanner& sc, int tile)
 			xscale = 1.0f / xscale;
 			yscale = 1.0f / yscale;
 
-			tileSetHightileReplacement(tile, pal, fn, alphacut, xscale, yscale, specpower, specfactor);
+			tileSetHightileReplacement(tile, pal, fn, alphacut, xscale, yscale, specpower, specfactor, indexed);
 		}
 	}
 }
@@ -485,6 +487,7 @@ void parseSkybox(FScanner& sc, FScriptPosition& pos)
 	FString faces[6];
 	FScanner::SavedPos blockend;
 	int tile = -1, pal = 0;
+	bool indexed = false;
 
 	if (sc.StartBraces(&blockend)) return;
 	while (!sc.FoundEndBrace(blockend))
@@ -498,10 +501,11 @@ void parseSkybox(FScanner& sc, FScriptPosition& pos)
 		else if (sc.Compare({ "lt", "lf", "left" })) sc.GetString(faces[3]);
 		else if (sc.Compare({ "up", "ceiling", "top", "ceil" })) sc.GetString(faces[4]);
 		else if (sc.Compare({ "dn", "floor", "bottom", "down" })) sc.GetString(faces[5]);
+		else if (sc.Compare("indexed")) indexed = true;
 		// skip over everything else.
 	}
 	if (tile < 0) pos.Message(MSG_ERROR, "skybox: missing tile number");
-	else tileSetSkybox(tile, pal, faces);
+	else tileSetSkybox(tile, pal, faces, indexed);
 }
 
 //===========================================================================
diff --git a/source/core/textures/buildtiles.cpp b/source/core/textures/buildtiles.cpp
index 5cd2b27c050..9b81e369128 100644
--- a/source/core/textures/buildtiles.cpp
+++ b/source/core/textures/buildtiles.cpp
@@ -60,7 +60,7 @@ enum
 
 BuildTiles TileFiles;
 
-int tileSetHightileReplacement(int picnum, int palnum, const char* filename, float alphacut, float xscale, float yscale, float specpower, float specfactor);
+int tileSetHightileReplacement(int picnum, int palnum, const char* filename, float alphacut, float xscale, float yscale, float specpower, float specfactor, bool indexed = false);
 
 //==========================================================================
 //
diff --git a/source/core/textures/hightile.cpp b/source/core/textures/hightile.cpp
index 6579c61122d..fa13f929ff7 100644
--- a/source/core/textures/hightile.cpp
+++ b/source/core/textures/hightile.cpp
@@ -59,6 +59,7 @@ struct HightileReplacement
 	float alphacut, specpower, specfactor;
 	uint16_t palnum;
 	bool issky;
+	bool indexed;
 };
 
 static TMap<int, TArray<HightileReplacement>> tileReplacements;
@@ -247,7 +248,7 @@ void PostLoadSetup()
 //
 //==========================================================================
 
-int tileSetHightileReplacement(int picnum, int palnum, const char* filename, float alphacut, float xscale, float yscale, float specpower, float specfactor)
+int tileSetHightileReplacement(int picnum, int palnum, const char* filename, float alphacut, float xscale, float yscale, float specpower, float specfactor, bool indexed)
 {
 	if ((uint32_t)picnum >= (uint32_t)MAXTILES) return -1;
 	if ((uint32_t)palnum >= (uint32_t)MAXPALOOKUPS) return -1;
@@ -273,6 +274,7 @@ int tileSetHightileReplacement(int picnum, int palnum, const char* filename, flo
 	replace.specpower = specpower; // currently unused
 	replace.specfactor = specfactor; // currently unused
 	replace.issky = 0;
+	replace.indexed = indexed;
 	replace.palnum = (uint16_t)palnum;
 	AddReplacement(picnum, replace);
 	return 0;
@@ -285,7 +287,7 @@ int tileSetHightileReplacement(int picnum, int palnum, const char* filename, flo
 //
 //==========================================================================
 
-int tileSetSkybox(int picnum, int palnum, FString* facenames)
+int tileSetSkybox(int picnum, int palnum, FString* facenames, bool indexed)
 {
 	if ((uint32_t)picnum >= (uint32_t)MAXTILES) return -1;
 	if ((uint32_t)palnum >= (uint32_t)MAXPALOOKUPS) return -1;
@@ -316,6 +318,7 @@ int tileSetSkybox(int picnum, int palnum, FString* facenames)
 	replace.image = MakeGameTexture(sbtex, "", ETextureType::Override);
 	TexMan.AddGameTexture(replace.image, false);
     replace.issky = 1;
+	replace.indexed = indexed;
 	replace.palnum = (uint16_t)palnum;
 	AddReplacement(picnum, replace);
 	return 0;
@@ -347,21 +350,24 @@ bool PickTexture(FRenderState *state, FGameTexture* tex, int paletteid, TextureP
 	auto rep = (hw_hightile && !(h.tintFlags & TINTF_ALWAYSUSEART)) ? FindReplacement(tex->GetID(), hipalswap, false) : nullptr;
 	if (rep || tex->GetTexture()->isHardwareCanvas())
 	{
-		if (usepalette > 0)
-		{
-			// This is a global setting for the entire scene, so let's do it here, right at the start. (Fixme: Store this in a static table instead of reusing the same entry for all palettes.)
-			auto& hh = lookups.tables[MAXPALOOKUPS - 1];
-			// This sets a tinting color for global palettes, e.g. water or slime - only used for hires replacements (also an option for low-resource hardware where duplicating the textures may be problematic.)
-			pick.basepalTint = hh.tintColor;
-		}
-
 		if (rep)
 		{
 			tex = rep->image;
 		}
-		if (!rep || rep->palnum != hipalswap || (h.tintFlags & TINTF_APPLYOVERALTPAL)) 
-			applytint = true;
-		pick.translation = 0;
+		if (!rep || !rep->indexed)
+		{
+			if (usepalette > 0)
+			{
+				// This is a global setting for the entire scene, so let's do it here, right at the start. (Fixme: Store this in a static table instead of reusing the same entry for all palettes.)
+				auto& hh = lookups.tables[MAXPALOOKUPS - 1];
+				// This sets a tinting color for global palettes, e.g. water or slime - only used for hires replacements (also an option for low-resource hardware where duplicating the textures may be problematic.)
+				pick.basepalTint = hh.tintColor;
+			}
+
+			if (!rep || rep->palnum != hipalswap || (h.tintFlags & TINTF_APPLYOVERALTPAL))
+				applytint = true;
+			pick.translation = 0;
+		}
 	}
 	else
 	{