[Hdrflow-svn] SF.net SVN: hdrflow: [400] trunk/lib/openlibraries/src/openimagelib/il

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

Revision: 400
          http://hdrflow.svn.sourceforge.net/hdrflow/?rev=400&view=rev
Author:   glslang
Date:     2008-01-10 14:09:39 -0800 (Thu, 10 Jan 2008)

Log Message:
-----------
+ dpx log to linear transfer function

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

Modified: trunk/lib/openlibraries/src/openimagelib/il/lut_functions.cpp
===================================================================
--- trunk/lib/openlibraries/src/openimagelib/il/lut_functions.cpp	2008-01-08 23:14:58 UTC (rev 399)
+++ trunk/lib/openlibraries/src/openimagelib/il/lut_functions.cpp	2008-01-10 22:09:39 UTC (rev 400)
@@ -10,10 +10,17 @@
 #include <cmath>
 #endif
 
+#include <limits>
+
 #include <openimagelib/il/il.hpp>
 
 namespace olib { namespace openimagelib { namespace il {
 
+namespace
+{
+	const float dpx_black_offset = 0.0107977516233f;
+}
+
 float to_sRGB( float v )
 {
 	if( v < ( 0.04045f / 12.92f ) )
@@ -38,4 +45,9 @@
 		return powf( ( v + 0.099f) / 1.099f, 1.0f / 0.45f );
 }
 
+float from_dpxLog( float v )
+{
+	return ( powf( 10.0f, ( v - 685.0f ) * ( 0.002f / 0.6f )) - dpx_black_offset ) / ( 1.0f - dpx_black_offset );
+}
+
 } } }

Modified: trunk/lib/openlibraries/src/openimagelib/il/lut_functions.hpp
===================================================================
--- trunk/lib/openlibraries/src/openimagelib/il/lut_functions.hpp	2008-01-08 23:14:58 UTC (rev 399)
+++ trunk/lib/openlibraries/src/openimagelib/il/lut_functions.hpp	2008-01-10 22:09:39 UTC (rev 400)
@@ -13,6 +13,7 @@
 IL_DECLSPEC float to_sRGB( float v );
 IL_DECLSPEC float to_rec709( float v );
 IL_DECLSPEC float from_rec709( float v );
+IL_DECLSPEC float from_dpxLog( float v );
 
 } } }
 


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