[Hdrflow-svn] SF.net SVN: hdrflow: [399] trunk/lib/openlibraries/src/openimagelib

[<gl...@us...>]

Revision: 399
          http://hdrflow.svn.sourceforge.net/hdrflow/?rev=399&view=rev
Author:   glslang
Date:     2008-01-08 15:14:58 -0800 (Tue, 08 Jan 2008)

Log Message:
-----------
+ rec709 transfer function

Modified Paths:
--------------
    trunk/lib/openlibraries/src/openimagelib/il/lut_functions.cpp
    trunk/lib/openlibraries/src/openimagelib/il/lut_functions.hpp
    trunk/lib/openlibraries/src/openimagelib/py/lut_functions.cpp

Modified: trunk/lib/openlibraries/src/openimagelib/il/lut_functions.cpp
===================================================================
--- trunk/lib/openlibraries/src/openimagelib/il/lut_functions.cpp	2008-01-06 11:09:50 UTC (rev 398)
+++ trunk/lib/openlibraries/src/openimagelib/il/lut_functions.cpp	2008-01-08 23:14:58 UTC (rev 399)
@@ -22,4 +22,20 @@
 		return 1.055f * powf( v, 1.0f / 2.4f ) - 0.055f;
 }
 
+float to_rec709( float v )
+{
+	if( v < 0.018f )
+		return v * 4.5f;
+	else
+		return 1.099f * powf( v, 0.45f ) - 0.099f;
+}
+
+float from_rec709( float v )
+{
+	if( v < 0.081 )
+		return v / 4.5f;
+	else
+		return powf( ( v + 0.099f) / 1.099f, 1.0f / 0.45f );
+}
+
 } } }

Modified: trunk/lib/openlibraries/src/openimagelib/il/lut_functions.hpp
===================================================================
--- trunk/lib/openlibraries/src/openimagelib/il/lut_functions.hpp	2008-01-06 11:09:50 UTC (rev 398)
+++ trunk/lib/openlibraries/src/openimagelib/il/lut_functions.hpp	2008-01-08 23:14:58 UTC (rev 399)
@@ -11,6 +11,8 @@
 namespace olib { namespace openimagelib { namespace il {
 
 IL_DECLSPEC float to_sRGB( float v );
+IL_DECLSPEC float to_rec709( float v );
+IL_DECLSPEC float from_rec709( float v );
 
 } } }
 

Modified: trunk/lib/openlibraries/src/openimagelib/py/lut_functions.cpp
===================================================================
--- trunk/lib/openlibraries/src/openimagelib/py/lut_functions.cpp	2008-01-06 11:09:50 UTC (rev 398)
+++ trunk/lib/openlibraries/src/openimagelib/py/lut_functions.cpp	2008-01-08 23:14:58 UTC (rev 399)
@@ -18,6 +18,8 @@
 void py_lut_functions( )
 {
 	py::def( "to_sRGB", &il::to_sRGB );
+	py::def( "to_rec709", &il::to_rec709 );
+	py::def( "from_rec709", &il::from_rec709 );
 }
 
 } } } }


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