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authorMattias Andrée <maandree@operamail.com>2014-02-21 06:46:33 +0100
committerMattias Andrée <maandree@operamail.com>2014-02-21 06:46:33 +0100
commit3e8eeadb2de8fb1fb4019d5bfaeff167d49fa5c5 (patch)
tree5dcbb15f87231c400a5e3d651a8415092dcb3361
parentextend doc about contrast and brightness (diff)
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beginning icc support
Signed-off-by: Mattias Andrée <maandree@operamail.com>
Diffstat (limited to '')
-rw-r--r--src/icc.py95
1 files changed, 95 insertions, 0 deletions
diff --git a/src/icc.py b/src/icc.py
new file mode 100644
index 0000000..705d135
--- /dev/null
+++ b/src/icc.py
@@ -0,0 +1,95 @@
+#!/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/>.
+
+
+def load_icc(pathname):
+ '''
+ Load ICC profile from a file
+
+ @param pathname The ICC profile file
+ @return Function to invoke, parameterless, to apply the ICC profile to the colour curves
+ '''
+ MLUT_TAG = 0x6d4c5554
+ VCGT_TAG = 0x76636774
+
+ def make_f(R_curve, G_curve, B_curve):
+ pass ## TODO
+
+ int_ = lambda bs : sum([bs[len(bs) - 1 - i] << (8 * i) for i in range(len(bs))])
+ def read(n):
+ if len(content) < n:
+ raise Except("Premature end of file: %s" % pathname)
+ rc, content[:] = content[:n], content[n:]
+ return rc
+
+ content = None
+ with open(pathname, 'rb') as file:
+ content = file.read()
+ content = list(content)
+ read(128)
+
+ n_tags, ptr = int_(read(4)), 128 + 4
+ for i_tag in range(n_tags):
+ tag_name = int_(read(4))
+ tag_offset = int_(read(4))
+ tag_size = int_(read(4))
+ ptr += 3 * 4
+ if tag_name == MLUT_TAG:
+ read(tag_offset - ptr)
+ R_curve, G_curve, B_curve = [], [], []
+ for i in range(256): R_curve.append(int_(read(2)))
+ for i in range(256): G_curve.append(int_(read(2)))
+ for i in range(256): B_curve.append(int_(read(2)))
+ return make_f(R_curve, G_curve, B_curve)
+ elif tag_name == VCGT_TAG:
+ read(tag_offset - ptr)
+ tag_name = int_(read(4))
+ if not tag_name == VCGT_TAG:
+ break
+ read(4)
+ gamma_type = int_(read(4))
+ if gamma_type == 0:
+ n_channels = int_(read(2))
+ n_entries = int_(read(2))
+ entry_size = int_(read(2))
+ if tag_size == 1584:
+ n_channels, n_entries, entry_size = 3, 256, 2
+ if not n_channels == 3: # assuming sRGB
+ break
+ int__ = lambda m : float(int(int_(read(m)) * 8 ** (2 - m)))
+ for i in range(n_entries): R_curve.append(int__(entry_size))
+ for i in range(n_entries): G_curve.append(int__(entry_size))
+ for i in range(n_entries): B_curve.append(int__(entry_size))
+ return make_f(R_curve, G_curve, B_curve)
+ elif gamma_type == 1:
+ r_gamma = int_(read(4)) / 65535
+ r_min = int_(read(4)) / 65535
+ r_max = int_(read(4)) / 65535
+ g_gamma = int_(read(4)) / 65535
+ g_min = int_(read(4)) / 65535
+ g_max = int_(read(4)) / 65535
+ b_gamma = int_(read(4)) / 65535
+ b_min = int_(read(4)) / 65535
+ b_max = int_(read(4)) / 65535
+ def f():
+ gamma(r_gamma, g_gamma, b_gamma)
+ rgb_limits(r_min, r_max, g_min, g_max, b_min, b_max)
+ return f
+ break
+
+ raise Exception("Unsupported ICC profile file")
+