Add a super simple color correction client example

examples/color-correction-ui.py

+#!/usr/bin/env python
+#
+# Simple example color correction UI.
+# Talks to an fcserver running on localhost.
+#
+# Micah Elizabeth Scott
+# This example code is released into the public domain.
+#
+
+import Tkinter as tk
+import socket
+import json
+import struct
+
+s = socket.socket()
+s.connect(('localhost', 7890))
+print "Connected to OPC server"
+
+def setGlobalColorCorrection(**obj):
+	msg = json.dumps(obj)
+	s.send(struct.pack(">BBH", 0, 0xF0, len(msg)) + msg)
+
+def update(_):
+	setGlobalColorCorrection(
+		gamma = gamma.get(),
+		whitepoint = [
+			red.get(),
+			green.get(),
+			blue.get(),
+		])
+
+def slider(name, from_, to):
+	s = tk.Scale(root, label=name, from_=from_, to=to, resolution=0.01,
+		showvalue='yes', orient='horizontal', length=400, command=update)
+	s.set(1.0)
+	s.pack()
+	return s
+
+root = tk.Tk()
+root.title("Fadecandy Color Correction Example")
+
+gamma = slider("Gamma", 0.2, 3.0)
+red = slider("Red", 0.0, 1.5)
+green = slider("Green", 0.0, 1.5)
+blue = slider("Blue", 0.0, 1.5)
+
+root.mainloop()