this curve looks better

gamma.py

@@ -1,14 +1,23 @@
 #!/usr/bin/python3
+"""Calculates a gamma correction curve to store
+in PROGMEM for a NeoPixel"""
 
-GAMMA = 2.8 # correction factor
+FACTOR = 2.8 # correction factor
 MAX_IN = 255 # top end of INPUT range
 MAX_OUT = 255 # top end of OUTPUT range
 
-print('{ \\')
-for index in range(MAX_IN):
+print('{', end='')
+for index in range(MAX_IN + 1):
     if index > 0:
         print(',', end='')
     if index & 15 == 0:
-        print()
-    print('%3d' % ((index / MAX_IN) ** GAMMA * MAX_OUT + 0.5), end='')
+        print(' \\')
+    if index == 0:
+        val = 0
+    elif index == MAX_IN:
+        val = MAX_IN
+    else:
+        val = (index / MAX_IN) ** FACTOR * MAX_OUT + 0.5
+        val = - (- val // 1) # round up
+    print('{0:>3d}'.format(int(val)), end='')
 print('}')