diff --git a/tools/palette_gamma.py b/tools/palette_gamma.py
new file mode 100755
index 00000000..4c7c1f81
--- /dev/null
+++ b/tools/palette_gamma.py
@@ -0,0 +1,21 @@
+#!/usr/bin/env python
+# vim:expandtab:ts=2 sw=2:
+#
+# show the 8bit values of 16 color palette with gamma correction
+# Used to build Thomson palettes
+#
+# (c) 2018 Thomas BERNARD
+
+import sys
+
+def palette_values(n, gamma):
+  return [int(round(255.0*pow(i/(n-1.0), 1.0/gamma))) for i in range (0,n)]
+
+def array_to_c(a):
+  return '{ ' + ', '.join(a) + '};'
+
+for i in range (0,22):
+  gamma = 1.0 + i / 10.0
+  p = palette_values(16, gamma)
+  print gamma, array_to_c(map(str, p))
+  print '   ', array_to_c(map(hex, p))