brightness gamma and contrast support

Signed-off-by: Mattias Andrée <maandree@operamail.com>

1 files changed, 65 insertions, 0 deletions

diff --git a/src/__main__.py b/src/__main__.py
new file mode 100755
index 0000000..257ed3e
--- /dev/null
+++ b/src/__main__.py
@@ -0,0 +1,65 @@
+#!/usr/bin/env python3
+
+# Copyright © 2014  Mattias Andrée (maandree@member.fsf.org)
+# 
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+# 
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+# 
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+
+r_curve = [i / 255 for i in range(256)]
+g_curve = [i / 255 for i in range(256)]
+b_curve = [i / 255 for i in range(256)]
+
+
+def curves(r, g, b):
+    return ((r_curve, r), (g_curve, g), (b_curve, b))
+
+
+def contrast(r, g, b):
+    for (curve, level) in curves(r, g, b):
+        if not level == 1.0:
+            for i in range(256):
+                curve[i] = (curve[i] - 0.5) * level + 0.5
+
+def brightness(r, g, b):
+    for (curve, level) in curves(r, g, b):
+        if not level == 1.0:
+            for i in range(256):
+                curve[i] *= level
+
+def gamma(r, g, b):
+    for (curve, level) in curves(r, g, b):
+        if not level == 1.0:
+            for i in range(256):
+                curve[i] **= level
+
+def clip():
+    for curve in (r_curve, g_curve, b_curve):
+        for i in range(256):
+            curve[i] = min(max(0.0, curve[i]), 1.0)
+
+
+contrast(1.0, 1.0, 1.0)
+brightness(1.0, 1.0, 1.0)
+gamma(1.0, 1.0, 1.0)
+temperature(1.0, 1.0, 1.0)
+clip()
+
+
+for curve in (r_curve, g_curve, b_curve):
+    for i in range(256):
+        curve[i] = int(curve[i] * 65535 + 0.5)
+print(r_curve)
+print(g_curve)
+print(b_curve)
+