diff --git a/demo/src/main/scripts/rgbcolors.groovy b/demo/src/main/scripts/rgbcolors.groovy
new file mode 100644
index 000000000..a8dff7fff
--- /dev/null
+++ b/demo/src/main/scripts/rgbcolors.groovy
@@ -0,0 +1,146 @@
+/*
+ * test rgb colors
+ END_HELP
+ */
+
+import org.jline.console.SystemRegistry
+import org.jline.utils.*
+
+class RgbColors {
+    def terminal = SystemRegistry.get().terminal()
+    int r,g,b
+/*
+https://gist.github.com/XVilka/8346728
+awk 'BEGIN{
+    s="/\\/\\/\\/\\/\\"; s=s s s s s s s s;
+    for (colnum = 0; colnum<77; colnum++) {
+        r = 255-(colnum*255/76);
+        g = (colnum*510/76);
+        b = (colnum*255/76);
+        if (g>255) g = 510-g;
+        printf "\033[48;2;%d;%d;%dm", r,g,b;
+        printf "\033[38;2;%d;%d;%dm", 255-r,255-g,255-b;
+        printf "%s\033[0m", substr(s,colnum+1,1);
+    }
+    printf "\n";
+}'
+*/
+    def getStyleRGB(def s) {
+         "bg-rgb:" + String.format("#%02x%02x%02x", r, g, b) +
+        ",fg-rgb:" + String.format("#%02x%02x%02x", 255 - r, 255 - g, 255 - b)
+    }
+
+    def printTrueColors() {
+        def asb = new AttributedStringBuilder()
+        int max = 127
+        for (def colnum = 0; colnum < max + 1; colnum++) {
+            r = (int) (255 - colnum * 255 / max)
+            g = (int) (colnum * 510 / max)
+            b = (int) (colnum * 255 / max)
+            if (g > 255) {
+                g = 510 - g
+            }
+            def style = new StyleResolver((ref) -> getStyleRGB(ref)).resolve('.rgb' + colnum)
+            asb.style(style)
+            asb.append(colnum % 2 == 0 ? '/' : '\\')
+        }
+        asb.toAttributedString().println(terminal)
+    }
+
+/*
+curl -s https://raw.githubusercontent.com/JohnMorales/dotfiles/master/colors/24-bit-color.sh | bash
+
+*/
+    def rainbowColor(int arg) {
+        int h = (int) (arg / 43)
+        int f = arg - 43*h
+        int t = (int) (f * 255 / 43)
+        int q = 255 - t
+        r = 0; g = 0; b = 0
+        if ( h == 0 ) {
+            r = 255
+            g = t
+        } else if ( h == 1 ) {
+            r = q
+            g = 255
+        } else if ( h == 2 ) {
+            g = 255
+            b = t
+        } else if ( h == 3 ) {
+            g = q
+            b = 255
+        } else if ( h == 4 ) {
+            r = t
+            b = 255
+        } else if ( h == 5 ) {
+            r = 255
+            b = q
+        }
+    }
+
+    def printColorBars() {
+        def asb = new AttributedStringBuilder()
+        g = 0; b = 0
+        for (r = 0; r < 128;  r++) {
+            def style = new StyleResolver((ref) -> getStyleRGB(ref)).resolve('.red' + r)
+            asb.style(style)
+            asb.append(" ")
+        }
+        asb.style(AttributedStyle.DEFAULT).append("\n")
+        for (r = 255; r > 127;  r--) {
+            def style = new StyleResolver((ref) -> getStyleRGB(ref)).resolve('.red' + r)
+            asb.style(style)
+            asb.append(" ")
+        }
+        asb.style(AttributedStyle.DEFAULT).append("\n")
+        r = 0
+        for (g = 0; g < 128;  g++) {
+            def style = new StyleResolver((ref) -> getStyleRGB(ref)).resolve('.green' + g)
+            asb.style(style)
+            asb.append(" ")
+        }
+        asb.style(AttributedStyle.DEFAULT).append("\n")
+        for (g = 255; g > 127;  g--) {
+            def style = new StyleResolver((ref) -> getStyleRGB(ref)).resolve('.green' + g)
+            asb.style(style)
+            asb.append(" ")
+        }
+        asb.style(AttributedStyle.DEFAULT).append("\n")
+        g = 0
+        for (b = 0; b < 128;  b++) {
+            def style = new StyleResolver((ref) -> getStyleRGB(ref)).resolve('.blue' + b)
+            asb.style(style)
+            asb.append(" ")
+        }
+        asb.style(AttributedStyle.DEFAULT).append("\n")
+        for (b = 255; b > 127;  b--) {
+            def style = new StyleResolver((ref) -> getStyleRGB(ref)).resolve('.blue' + b)
+            asb.style(style)
+            asb.append(" ")
+        }
+        asb.style(AttributedStyle.DEFAULT).append("\n")
+        for (int i = 0; i < 128;  i++) {
+            rainbowColor(i)
+            def style = new StyleResolver((ref) -> getStyleRGB(ref)).resolve('.rainbow' + i)
+            asb.style(style)
+            asb.append(" ")
+        }
+        asb.style(AttributedStyle.DEFAULT).append("\n")
+        for (int i = 255; i > 127;  i--) {
+            rainbowColor(i)
+            def style = new StyleResolver((ref) -> getStyleRGB(ref)).resolve('.rainbow' + i)
+            asb.style(style)
+            asb.append(" ")
+        }
+        asb.style(AttributedStyle.DEFAULT).append("\n")
+        asb.toAttributedString().println(terminal)
+    }
+
+}
+
+def static main(def _args){
+    def colorTest = new RgbColors()
+    colorTest.printTrueColors()
+    colorTest.printColorBars()
+}
+