diff --git a/progress.cpp b/progress.cpp
index 9d9d3ea..302aff0 100644
--- a/progress.cpp
+++ b/progress.cpp
@@ -2,6 +2,7 @@
 #include <ctime>
 #include <cstdlib>
 #include <libscterm.hpp>
+#include <libscscreensaver.hpp>
 
 void show_rows_cols(const sc::term& t) {
     std::cout << t.rows() << " rows, " << t.cols() << " cols\n";
@@ -125,48 +126,20 @@ void show_truecolor(const sc::term& t) {
         return;
     }
     const char* lhb = u8"\u2584"; // lower half block
-    int inc = 6.0 * t.cols() / 256.0;
-    if (inc == 0) inc = 1;
-    for (int s = 16; s < 224; s += 32) {
-        int r = s;
-        int g = 0;
-        int b = 0;
-        // red -> yellow
-        while (g <= s) {
-            std::cerr << sc::io::truecolorb(r, g, b) << sc::io::truecolorf(r, 16 + g, b) << lhb;
-            g += inc;
+    const double sat = 1.0;
+    for (double bri = 0; bri < 1; bri += 0.2) {
+        for (double hue = 0; hue < 360; hue += 360.0 / t.cols()) {
+            HSB hsbb = {hue, sat, bri};
+            Color bg {hsbb};
+            RGB rgbb = RGB(bg);
+            HSB hsbf = {hue, sat, bri + 0.1};
+            Color fg {hsbf};
+            RGB rgbf = RGB(fg);
+            std::cerr << sc::io::truecolorb(rgbb.r * 255, rgbb.g * 255, rgbb.b * 255);
+            std::cerr << sc::io::truecolorf(rgbf.r * 255, rgbf.g * 255, rgbf.b * 255);
+            std::cerr << lhb;
         }
-        g = s;
-        // yellow -> green
-        while (r >= 0) {
-            std::cerr << sc::io::truecolorb(r, g, b) << sc::io::truecolorf(16 + r, g, b) << lhb;
-            r -= inc;
-        }
-        r = 0;
-        // green -> cyan
-        while (b < s) {
-            std::cerr << sc::io::truecolorb(r, g, b) << sc::io::truecolorf(r, g, 16 + b) << lhb;
-            b += inc;
-        }
-        b = s;
-        // cyan -> blue
-        while (g >= 0) {
-            std::cerr << sc::io::truecolorb(r, g, b) << sc::io::truecolorf(r, 16 + g, b) << lhb;
-            g -= inc;
-        }
-        g = 0;
-        // blue -> magenta
-        while (r <= s) {
-            std::cerr << sc::io::truecolorb(r, g, b) << sc::io::truecolorf(16 + r, g, b) << lhb;
-            r += inc;
-        }
-        r = s;
-        // magenta -> red
-        while (b >= 0) {
-            std::cerr << sc::io::truecolorb(r, g, b) << sc::io::truecolorf(r, g, 16 + b) << lhb;
-            b -= inc;
-        }
-        std::cerr << sc::io::reset << std::endl;
+        std::cerr << std::endl;
     }
 }