diff --git a/src/net/sourceforge/plantuml/argon2/algorithm/Functions.java b/src/net/sourceforge/plantuml/argon2/algorithm/Functions.java
index 7f16ddd2e..6caade190 100644
--- a/src/net/sourceforge/plantuml/argon2/algorithm/Functions.java
+++ b/src/net/sourceforge/plantuml/argon2/algorithm/Functions.java
@@ -17,7 +17,7 @@ class Functions {
 
 
     /**
-     * H0 = H64(p, τ, m, t, v, y, |P|, P, |S|, S, |L|, K, |X|, X)
+     * H0 = H64(p, \u03c4, m, t, v, y, |P|, P, |S|, S, |L|, K, |X|, X)
      * -> 64 byte (ARGON2_PREHASH_DIGEST_LENGTH)
      */
     static byte[] initialHash(byte[] lanes, byte[] outputLength,
diff --git a/src/net/sourceforge/plantuml/tikz/TikzGraphics.java b/src/net/sourceforge/plantuml/tikz/TikzGraphics.java
index 8bc00cd32..f2dd9237e 100644
--- a/src/net/sourceforge/plantuml/tikz/TikzGraphics.java
+++ b/src/net/sourceforge/plantuml/tikz/TikzGraphics.java
@@ -55,6 +55,9 @@ import net.sourceforge.plantuml.eps.EpsGraphics;
 import net.sourceforge.plantuml.ugraphic.UPath;
 import net.sourceforge.plantuml.ugraphic.USegment;
 import net.sourceforge.plantuml.ugraphic.USegmentType;
+import net.sourceforge.plantuml.ugraphic.color.ColorMapper;
+import net.sourceforge.plantuml.ugraphic.color.HColor;
+import net.sourceforge.plantuml.ugraphic.color.HColorUtils;
 import net.sourceforge.plantuml.version.Version;
 
 public class TikzGraphics {
@@ -65,19 +68,21 @@ public class TikzGraphics {
 	private final List<String> cmd = new ArrayList<>();
 	private final boolean withPreamble;
 
-	private Color color = Color.BLACK;
-	private Color fillcolor = Color.BLACK;
-	private Color fillcolorGradient2 = null;
+	private HColor color = HColorUtils.BLACK;
+	private HColor fillcolor = HColorUtils.BLACK;
+	private HColor fillcolorGradient2 = null;
 	private char gradientPolicy;
 	private double thickness = 1.0;
 	private final double scale;
 	private String dash = null;
+	private final ColorMapper mapper;
 
 	private final Map<Color, String> colornames = new LinkedHashMap<Color, String>();
 
-	public TikzGraphics(double scale, boolean withPreamble) {
+	public TikzGraphics(double scale, boolean withPreamble, ColorMapper mapper) {
 		this.withPreamble = withPreamble;
 		this.scale = scale;
+		this.mapper = mapper;
 	}
 
 	private final Map<String, Integer> styles = new LinkedHashMap<String, Integer>();
@@ -103,17 +108,32 @@ public class TikzGraphics {
 		}
 	}
 
-	private String getColorName(Color c) {
-		if (c.equals(Color.WHITE))
+	private String getColorName(HColor hcolor) {
+		final Color color = mapper.toColor(hcolor);
+		if (color.equals(Color.WHITE))
 			return "white";
 
-		if (c.equals(Color.BLACK))
+		if (color.equals(Color.BLACK))
 			return "black";
 
-		final String result = colornames.get(c);
+		final String result = colornames.get(color);
 		return Objects.requireNonNull(result);
 	}
 
+	private void appendFillColor(StringBuilder sb, boolean colorBackup) {
+		if (fillcolor == null)
+			return;
+
+		if (mustApplyFillColor()) {
+			sb.append("fill=" + getColorName(fillcolor) + ",");
+			if (color == null && colorBackup)
+				sb.append("color=" + getColorName(fillcolor) + ",");
+		} else {
+			sb.append("fill opacity=0,");
+		}
+
+	}
+
 	public void createData(OutputStream os) throws IOException {
 		if (withPreamble) {
 			out(os, "\\documentclass{standalone}");
@@ -227,7 +247,8 @@ public class TikzGraphics {
 				sb.append("color=" + getColorName(color) + ",");
 
 			if (mustApplyFillColor()) {
-				sb.append("fill=" + getColorName(fillcolor) + ",");
+				appendFillColor(sb, true);
+				// sb.append("fill=" + getColorName(fillcolor) + ",");
 				if (color == null)
 					sb.append("color=" + getColorName(fillcolor) + ",");
 
@@ -438,7 +459,8 @@ public class TikzGraphics {
 			sb.append("bottom color=" + getColorName(fillcolorGradient2) + ",");
 			sb.append("shading=axis,shading angle=" + getAngleFromGradientPolicy() + ",");
 		} else if (mustApplyFillColor()) {
-			sb.append("fill=" + getColorName(fillcolor) + ",");
+			appendFillColor(sb, false);
+			// sb.append("fill=" + getColorName(fillcolor) + ",");
 			if (color == null)
 				sb.append("color=" + getColorName(fillcolor) + ",");
 
@@ -448,7 +470,11 @@ public class TikzGraphics {
 	private boolean mustApplyFillColor() {
 		if (fillcolor == null)
 			return false;
-		if (fillcolor.getAlpha() == 0)
+
+		if (HColorUtils.isTransparent(fillcolor))
+			return false;
+
+		if (mapper.toColor(fillcolor).getAlpha() == 0)
 			return false;
 		return true;
 	}
@@ -592,38 +618,42 @@ public class TikzGraphics {
 
 	}
 
-	public void setFillColor(Color c) {
-		// if (c == null) {
-		// c = Color.WHITE;
-		// }
+	public void setFillColor(HColor c) {
 		this.fillcolor = c;
 		this.fillcolorGradient2 = null;
-		addColor(c);
+		if (mustApplyFillColor())
+			addColor(fillcolor);
+
 	}
 
-	public void setGradientColor(Color c1, Color c2, char policy) {
+	public void setGradientColor(HColor c1, HColor c2, char policy) {
 		this.fillcolor = c1;
 		this.fillcolorGradient2 = c2;
 		this.gradientPolicy = policy;
-		addColor(c1);
-		addColor(c2);
+		if (mustApplyFillColor())
+			addColor(fillcolor);
+
+		addColor(fillcolorGradient2);
 	}
 
-	public void setStrokeColor(Color c) {
+	public void setStrokeColor(HColor c) {
 		// Objects.requireNonNull(c);
 		this.color = c;
 		addColor(c);
 	}
 
-	private void addColor(Color c) {
-		if (c == null)
+	private void addColor(HColor hcolor) {
+		if (hcolor == null)
+			return;
+		final Color color = mapper.toColor(hcolor);
+		if (color == null)
 			return;
 
-		if (colornames.containsKey(c))
+		if (colornames.containsKey(color))
 			return;
 
 		final String name = "plantucolor" + String.format("%04d", colornames.size());
-		colornames.put(c, name);
+		colornames.put(color, name);
 	}
 
 	public void setStrokeWidth(double thickness, String dash) {
diff --git a/src/net/sourceforge/plantuml/ugraphic/tikz/DriverAtomTextTikz.java b/src/net/sourceforge/plantuml/ugraphic/tikz/DriverAtomTextTikz.java
index 868a36d5e..b6d7f6f8b 100644
--- a/src/net/sourceforge/plantuml/ugraphic/tikz/DriverAtomTextTikz.java
+++ b/src/net/sourceforge/plantuml/ugraphic/tikz/DriverAtomTextTikz.java
@@ -50,7 +50,7 @@ public class DriverAtomTextTikz implements UDriver<AtomText, TikzGraphics> {
 		final FontConfiguration fontConfiguration = text.getFontConfiguration();
 		final UFont font = fontConfiguration.getFont();
 		final HColor col = fontConfiguration.getColor();
-		tikz.setStrokeColor(mapper.toColor(col));
+		tikz.setStrokeColor(col);
 		final boolean underline = fontConfiguration.containsStyle(FontStyle.UNDERLINE);
 		final boolean italic = font.isItalic();
 		final boolean bold = font.isBold();
diff --git a/src/net/sourceforge/plantuml/ugraphic/tikz/DriverCenteredCharacterTikz.java b/src/net/sourceforge/plantuml/ugraphic/tikz/DriverCenteredCharacterTikz.java
index 01cbbbca6..85555ac7d 100644
--- a/src/net/sourceforge/plantuml/ugraphic/tikz/DriverCenteredCharacterTikz.java
+++ b/src/net/sourceforge/plantuml/ugraphic/tikz/DriverCenteredCharacterTikz.java
@@ -57,7 +57,7 @@ public class DriverCenteredCharacterTikz implements UDriver<UCenteredCharacter,
 		final double ypos = y - unusedSpace.getCenterY() - 0.5;
 
 		final TextLayout t = createTextLayout(font, "" + c);
-		tikz.setStrokeColor(mapper.toColor(param.getColor()));
+		tikz.setStrokeColor(param.getColor());
 		tikz.drawPathIterator(xpos, ypos, t.getOutline(null).getPathIterator(null));
 	}
 
diff --git a/src/net/sourceforge/plantuml/ugraphic/tikz/DriverCenteredCharacterTikz2.java b/src/net/sourceforge/plantuml/ugraphic/tikz/DriverCenteredCharacterTikz2.java
index 9acdb01ac..4099e63b1 100644
--- a/src/net/sourceforge/plantuml/ugraphic/tikz/DriverCenteredCharacterTikz2.java
+++ b/src/net/sourceforge/plantuml/ugraphic/tikz/DriverCenteredCharacterTikz2.java
@@ -45,7 +45,7 @@ public class DriverCenteredCharacterTikz2 implements UDriver<UCenteredCharacter,
 	public void draw(UCenteredCharacter centeredCharacter, double x, double y, ColorMapper mapper, UParam param, TikzGraphics tikz) {
 		final char c = centeredCharacter.getChar();
 
-		tikz.setStrokeColor(mapper.toColor(param.getColor()));
+		tikz.setStrokeColor(param.getColor());
 		tikz.drawSingleCharacter(x, y, c);
 	}
 
diff --git a/src/net/sourceforge/plantuml/ugraphic/tikz/DriverDotPathTikz.java b/src/net/sourceforge/plantuml/ugraphic/tikz/DriverDotPathTikz.java
index 27ad92444..0f24778c9 100644
--- a/src/net/sourceforge/plantuml/ugraphic/tikz/DriverDotPathTikz.java
+++ b/src/net/sourceforge/plantuml/ugraphic/tikz/DriverDotPathTikz.java
@@ -44,7 +44,7 @@ public class DriverDotPathTikz implements UDriver<DotPath, TikzGraphics> {
 
 	public void draw(DotPath path, double x, double y, ColorMapper mapper, UParam param, TikzGraphics tikz) {
 		tikz.setFillColor(null);
-		tikz.setStrokeColor(mapper.toColor(param.getColor()));
+		tikz.setStrokeColor(param.getColor());
 		tikz.setStrokeWidth(param.getStroke().getThickness(), param.getStroke().getDashTikz());
 		tikz.upath(x, y, path.toUPath());
 	}
diff --git a/src/net/sourceforge/plantuml/ugraphic/tikz/DriverEllipseTikz.java b/src/net/sourceforge/plantuml/ugraphic/tikz/DriverEllipseTikz.java
index c6e61e9c2..355496fbf 100644
--- a/src/net/sourceforge/plantuml/ugraphic/tikz/DriverEllipseTikz.java
+++ b/src/net/sourceforge/plantuml/ugraphic/tikz/DriverEllipseTikz.java
@@ -50,8 +50,8 @@ public class DriverEllipseTikz implements UDriver<UEllipse, TikzGraphics> {
 		final double extend = shape.getExtend();
 		final double cx = x + width / 2;
 		final double cy = y + height / 2;
-		tikz.setFillColor(mapper.toColor(param.getBackcolor()));
-		tikz.setStrokeColor(mapper.toColor(param.getColor()));
+		tikz.setFillColor(param.getBackcolor());
+		tikz.setStrokeColor(param.getColor());
 		tikz.setStrokeWidth(param.getStroke().getThickness(), param.getStroke().getDashTikz());
 		if (start == 0 && extend == 0) {
 			tikz.ellipse(cx, cy, width / 2, height / 2);
diff --git a/src/net/sourceforge/plantuml/ugraphic/tikz/DriverLineTikz.java b/src/net/sourceforge/plantuml/ugraphic/tikz/DriverLineTikz.java
index 7171e527a..dd395f8e8 100644
--- a/src/net/sourceforge/plantuml/ugraphic/tikz/DriverLineTikz.java
+++ b/src/net/sourceforge/plantuml/ugraphic/tikz/DriverLineTikz.java
@@ -45,7 +45,7 @@ public class DriverLineTikz implements UDriver<ULine, TikzGraphics> {
 	public void draw(ULine line, double x, double y, ColorMapper mapper, UParam param, TikzGraphics tikz) {
 		double x2 = x + line.getDX();
 		double y2 = y + line.getDY();
-		tikz.setStrokeColor(mapper.toColor(param.getColor()));
+		tikz.setStrokeColor(param.getColor());
 		tikz.setStrokeWidth(param.getStroke().getThickness(), param.getStroke().getDashTikz());
 		tikz.line(x, y, x2, y2);
 	}
diff --git a/src/net/sourceforge/plantuml/ugraphic/tikz/DriverPathTikz.java b/src/net/sourceforge/plantuml/ugraphic/tikz/DriverPathTikz.java
index 581e51480..5519a87e5 100644
--- a/src/net/sourceforge/plantuml/ugraphic/tikz/DriverPathTikz.java
+++ b/src/net/sourceforge/plantuml/ugraphic/tikz/DriverPathTikz.java
@@ -50,13 +50,11 @@ public class DriverPathTikz implements UDriver<UPath, TikzGraphics> {
 		final HColor back = param.getBackcolor();
 		if (back instanceof HColorGradient) {
 			final HColorGradient gr = (HColorGradient) back;
-			final Color color1 = mapper.toColor(gr.getColor1());
-			final Color color2 = mapper.toColor(gr.getColor2());
-			tikz.setGradientColor(color1, color2, gr.getPolicy());
+			tikz.setGradientColor(gr.getColor1(), gr.getColor2(), gr.getPolicy());
 		} else {
-			tikz.setFillColor(mapper.toColor(back));
+			tikz.setFillColor(back);
 		}
-		tikz.setStrokeColor(mapper.toColor(param.getColor()));
+		tikz.setStrokeColor(param.getColor());
 		tikz.setStrokeWidth(param.getStroke().getThickness(), param.getStroke().getDashTikz());
 		tikz.upath(x, y, path);
 	}
diff --git a/src/net/sourceforge/plantuml/ugraphic/tikz/DriverPolygonTikz.java b/src/net/sourceforge/plantuml/ugraphic/tikz/DriverPolygonTikz.java
index f636ce7e2..85c41e01b 100644
--- a/src/net/sourceforge/plantuml/ugraphic/tikz/DriverPolygonTikz.java
+++ b/src/net/sourceforge/plantuml/ugraphic/tikz/DriverPolygonTikz.java
@@ -52,13 +52,11 @@ public class DriverPolygonTikz implements UDriver<UPolygon, TikzGraphics> {
 		final HColor back = param.getBackcolor();
 		if (back instanceof HColorGradient) {
 			final HColorGradient gr = (HColorGradient) back;
-			final Color color1 = mapper.toColor(gr.getColor1());
-			final Color color2 = mapper.toColor(gr.getColor2());
-			tikz.setGradientColor(color1, color2, gr.getPolicy());
+			tikz.setGradientColor(gr.getColor1(), gr.getColor2(), gr.getPolicy());
 		} else {
-			tikz.setFillColor(mapper.toColor(back));
+			tikz.setFillColor(back);
 		}
-		tikz.setStrokeColor(mapper.toColor(param.getColor()));
+		tikz.setStrokeColor(param.getColor());
 		tikz.setStrokeWidth(param.getStroke().getThickness(), param.getStroke().getDashTikz());
 
 		tikz.polygon(points);
diff --git a/src/net/sourceforge/plantuml/ugraphic/tikz/DriverRectangleTikz.java b/src/net/sourceforge/plantuml/ugraphic/tikz/DriverRectangleTikz.java
index 0e96ec91e..073b2883a 100644
--- a/src/net/sourceforge/plantuml/ugraphic/tikz/DriverRectangleTikz.java
+++ b/src/net/sourceforge/plantuml/ugraphic/tikz/DriverRectangleTikz.java
@@ -55,13 +55,11 @@ public class DriverRectangleTikz implements UDriver<URectangle, TikzGraphics> {
 		final HColor back = param.getBackcolor();
 		if (back instanceof HColorGradient) {
 			final HColorGradient gr = (HColorGradient) back;
-			final Color color1 = mapper.toColor(gr.getColor1());
-			final Color color2 = mapper.toColor(gr.getColor2());
-			tikz.setGradientColor(color1, color2, gr.getPolicy());
+			tikz.setGradientColor(gr.getColor1(), gr.getColor2(), gr.getPolicy());
 		} else {
-			tikz.setFillColor(mapper.toColor(back));
+			tikz.setFillColor(back);
 		}
-		tikz.setStrokeColor(mapper.toColor(param.getColor()));
+		tikz.setStrokeColor(param.getColor());
 		tikz.setStrokeWidth(param.getStroke().getThickness(), param.getStroke().getDashTikz());
 		if (r == 0) {
 			tikz.rectangle(x, y, width, height);
diff --git a/src/net/sourceforge/plantuml/ugraphic/tikz/DriverTextTikz.java b/src/net/sourceforge/plantuml/ugraphic/tikz/DriverTextTikz.java
index 579c77782..0c0642b7d 100644
--- a/src/net/sourceforge/plantuml/ugraphic/tikz/DriverTextTikz.java
+++ b/src/net/sourceforge/plantuml/ugraphic/tikz/DriverTextTikz.java
@@ -50,7 +50,7 @@ public class DriverTextTikz implements UDriver<UText, TikzGraphics> {
 		final FontConfiguration fontConfiguration = shape.getFontConfiguration();
 		final UFont font = fontConfiguration.getFont();
 		final HColor col = fontConfiguration.getColor();
-		tikz.setStrokeColor(mapper.toColor(col));
+		tikz.setStrokeColor(col);
 		final boolean underline = fontConfiguration.containsStyle(FontStyle.UNDERLINE);
 		final boolean italic = font.isItalic();
 		final boolean bold = font.isBold();
diff --git a/src/net/sourceforge/plantuml/ugraphic/tikz/UGraphicTikz.java b/src/net/sourceforge/plantuml/ugraphic/tikz/UGraphicTikz.java
index 1adad5540..903174443 100644
--- a/src/net/sourceforge/plantuml/ugraphic/tikz/UGraphicTikz.java
+++ b/src/net/sourceforge/plantuml/ugraphic/tikz/UGraphicTikz.java
@@ -60,7 +60,7 @@ import net.sourceforge.plantuml.ugraphic.color.HColor;
 public class UGraphicTikz extends AbstractUGraphic<TikzGraphics> implements ClipContainer {
 
 	public UGraphicTikz(HColor defaultBackground, ColorMapper colorMapper, StringBounder stringBounder, double scale, boolean withPreamble) {
-		super(defaultBackground, colorMapper, stringBounder, new TikzGraphics(scale, withPreamble));
+		super(defaultBackground, colorMapper, stringBounder, new TikzGraphics(scale, withPreamble, colorMapper));
 		register();
 	}
 
diff --git a/src/net/sourceforge/plantuml/version/Version.java b/src/net/sourceforge/plantuml/version/Version.java
index 62222406c..e42e6f315 100644
--- a/src/net/sourceforge/plantuml/version/Version.java
+++ b/src/net/sourceforge/plantuml/version/Version.java
@@ -80,7 +80,7 @@ public class Version {
 	}
 
 	public static int beta() {
-		final int beta = 3;
+		final int beta = 4;
 		return beta;
 	}