diff --git a/cvarinfo.marifx b/cvarinfo.marifx
index 78a5b89..d0647fa 100644
--- a/cvarinfo.marifx
+++ b/cvarinfo.marifx
@@ -120,7 +120,7 @@ nosave int mfx_palnum = 0;
 nosave float mfx_palsat = 1.;
 nosave float mfx_palpow = 1.;
 nosave int mfx_paldither = 3;
-nosave int mfx_paldepth = 6;
+nosave int mfx_paldepth = 8;
 
 nosave string mfx_presetname = "Unnamed";
 
diff --git a/language.txt b/language.txt
index 75505b6..6b504be 100644
--- a/language.txt
+++ b/language.txt
@@ -78,6 +78,7 @@ MFX_PALETTE61="RGB3";
 MFX_PALETTE62="RGB4";
 MFX_PALETTE63="RGB5";
 MFX_PALETTE64="RGB6";
+MFX_DITHER0="No Dither";
 MFX_DITHER1="Checkerboard";
 MFX_DITHER2="Bayer 2x2";
 MFX_DITHER3="Bayer 4x4";
diff --git a/menudef.txt b/menudef.txt
index a58d351..41df035 100644
--- a/menudef.txt
+++ b/menudef.txt
@@ -107,6 +107,7 @@ OptionValue "MFXPalette"
 
 OptionValue "MFXDither"
 {
+	-1, "$MFX_DITHER0"
 	0, "$MFX_DITHER1"
 	1, "$MFX_DITHER2"
 	2, "$MFX_DITHER3"
@@ -318,6 +319,6 @@ OptionMenu "MFXOptionsMenu"
 	MFXSlider "$MFX_PALSAT", "mfx_palsat", 0, 2, 0.01, 2
 	MFXSlider "$MFX_PALPOW", "mfx_palpow", 0, 2, 0.01, 2
 	Option "$MFX_PALDITHER", "mfx_paldither", "MFXDither"
-	MFXSlider "$MFX_PALDEPTH", "mfx_paldepth", 1, 6, 1, 0
+	MFXSlider "$MFX_PALDEPTH", "mfx_paldepth", 1, 16, 1, 0
 	SafeCommand "$MFX_RESET", "event resetmfxvars 7"
 }
diff --git a/shaders/glsl/mfx_palette.fp b/shaders/glsl/mfx_palette.fp
index 8ea86cc..142bd87 100644
--- a/shaders/glsl/mfx_palette.fp
+++ b/shaders/glsl/mfx_palette.fp
@@ -35,8 +35,8 @@ void main()
 	float dth = texelFetch(DitherTexture,dcoord,0).x*.9375+.03125;
 	vec3 thr = vec3(step(dth,cf.r),step(dth,cf.g),step(dth,cf.b));
 	res.rgb = mix(cl,ch,thr);
-	vec3 lc = clamp(floor(res.rgb*64.),0.,63.);
-	ivec2 lcoord = ivec2(lc.r,lc.g+lc.b*64);
+	vec3 lc = clamp(floor(res.rgb*63.),0.,63.);
+	ivec2 lcoord = ivec2(int(lc.r),int(lc.g)+int(lc.b)*64);
 	lcoord.x += 64*palnum;
 	res.rgb = texelFetch(PalLUTTexture,lcoord,0).rgb;
 	FragColor = res;
diff --git a/zscript/mfx_handler.zsc b/zscript/mfx_handler.zsc
index dde93f8..fd9fc60 100644
--- a/zscript/mfx_handler.zsc
+++ b/zscript/mfx_handler.zsc
@@ -164,9 +164,13 @@ Class MariFXHandler : StaticEventHandler
 		Shader.SetUniform2f(p,"mfx_palette","sfact",mfx_retroenable?bresl:rresl);
 		Shader.SetUniform1f(p,"mfx_palette","palsat",mfx_palsat);
 		Shader.SetUniform1f(p,"mfx_palette","palpow",mfx_palpow);
-		Shader.SetUniform1i(p,"mfx_palette","paldepth",mfx_paldepth);
+		Shader.SetUniform1i(p,"mfx_palette","paldepth",int(2.**mfx_paldepth)-1);
 		switch ( mfx_paldither )
 		{
+		case 0:
+			Shader.SetUniform1i(p,"mfx_palette","dsize",2);
+			Shader.SetUniform1i(p,"mfx_palette","doffset",0);
+			break;
 		case 1:
 			Shader.SetUniform1i(p,"mfx_palette","dsize",2);
 			Shader.SetUniform1i(p,"mfx_palette","doffset",2);
@@ -184,7 +188,7 @@ Class MariFXHandler : StaticEventHandler
 			Shader.SetUniform1i(p,"mfx_palette","doffset",16);
 			break;
 		default:
-			Shader.SetUniform1i(p,"mfx_palette","dsize",2);
+			Shader.SetUniform1i(p,"mfx_palette","dsize",1);
 			Shader.SetUniform1i(p,"mfx_palette","doffset",0);
 			break;
 		}