gegl r2236 - in trunk: . operations/common

From: ok svn gnome org
To: svn-commits-list gnome org
Subject: gegl r2236 - in trunk: . operations/common
Date: Sat, 26 Apr 2008 10:09:55 +0100 (BST)
Author: ok
Date: Sat Apr 26 09:09:54 2008
New Revision: 2236
URL: http://svn.gnome.org/viewvc/gegl?rev=2236&view=rev

Log:
* operations/common/color-temperature.c: added a manual white balance
corrector that computes the adjustment based on color temperature
values from Jan Heller.
* AUTHORS: added Jan Heller.


Added:
   trunk/operations/common/color-temperature.c
Modified:
   trunk/AUTHORS
   trunk/ChangeLog

Modified: trunk/AUTHORS
==============================================================================
--- trunk/AUTHORS	(original)
+++ trunk/AUTHORS	Sat Apr 26 09:09:54 2008
@@ -6,7 +6,7 @@
 Richard Kralovic, Kevin Cozens, Victor Bogado, Martin Nordholts, Geert
 Jordaens, Michael Schumacher, John Marshall, Ãtienne Bersac, Mark Probst, HÃkon
 Hitland, Tor Lillqvist, Hans Breuer, Deji Akingunola and Bradley Broom,
-Hans Petter Jansson.
+Hans Petter Jansson, Jan Heller.
 
 Documentation:
 ^^^^^^^^^^^^^^

Added: trunk/operations/common/color-temperature.c
==============================================================================
--- (empty file)
+++ trunk/operations/common/color-temperature.c	Sat Apr 26 09:09:54 2008
@@ -0,0 +1,705 @@
+/* This file is an image processing operation for GEGL
+ *
+ * GEGL is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * GEGL 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with GEGL; if not, see <http://www.gnu.org/licenses/>.
+ *
+ * Copyright 2008 Jan Heller <jan heller matfyz cz>
+ */
+
+#ifdef GEGL_CHANT_PROPERTIES
+
+gegl_chant_double (original_temp, "Original temperature", 1000, 12000, 6500, "Estimated temperature of the light source in K the image was taken with.")
+gegl_chant_double (intended_temp, "Intended temperature", 1000, 12000, 6500, "Corrected estimation of the temperatureof the light source in K.")
+
+#else
+
+#define GEGL_CHANT_TYPE_POINT_FILTER
+#define GEGL_CHANT_C_FILE       "color-temperature.c"
+
+#include "gegl-chant.h"
+
+#define LOWEST_TEMPERATURE     1000  
+#define HIGHEST_TEMPERATURE   12000
+#define TEMPERATURE_STEP         20
+
+#define LERP(x, x0, y0, x1, y1) (y0 + (x - x0) * (gfloat) (y1 - y0) / (gfloat) (x1 - x0))
+
+gfloat planckian_locus[][3];
+
+static void
+convert_k_to_rgb (gfloat temperature, 
+                  gfloat *rgb)
+{
+  int    ilow, ihigh;
+  int    delta_temperature;
+  gfloat resid_temperature;   
+
+  if (temperature < LOWEST_TEMPERATURE)
+    temperature = LOWEST_TEMPERATURE;
+
+  if (temperature > HIGHEST_TEMPERATURE)
+    temperature = HIGHEST_TEMPERATURE;
+
+  delta_temperature = temperature - LOWEST_TEMPERATURE;
+  ilow = delta_temperature / TEMPERATURE_STEP;
+  ihigh = (delta_temperature % TEMPERATURE_STEP) ? ilow + 1 : ilow;
+  resid_temperature = temperature - (ilow * TEMPERATURE_STEP + LOWEST_TEMPERATURE);
+
+  rgb[0] = LERP(resid_temperature,
+                0,
+                planckian_locus[ilow][0],
+                TEMPERATURE_STEP,
+                planckian_locus[ihigh][0]);
+                 
+  rgb[1] = LERP(resid_temperature,
+                0,
+                planckian_locus[ilow][1],
+                TEMPERATURE_STEP,
+                planckian_locus[ihigh][1]);
+
+  rgb[2] = LERP(resid_temperature,
+                0,
+                planckian_locus[ilow][2],
+                TEMPERATURE_STEP,
+                planckian_locus[ihigh][2]);
+}
+
+static void prepare (GeglOperation *operation)
+{
+  Babl *format = babl_format ("RGBA float");
+  gegl_operation_set_format (operation, "input", format);
+  gegl_operation_set_format (operation, "output", format);
+}
+
+/* GeglOperationPointFilter gives us a linear buffer to operate on
+ * in our requested pixel format
+ */
+static gboolean
+process (GeglOperation *op,
+         void          *in_buf,
+         void          *out_buf,
+         glong          n_pixels)
+{
+  GeglChantO *o = GEGL_CHANT_PROPERTIES (op);
+  gfloat     *in_pixel;
+  gfloat     *out_pixel;
+  gfloat      original_temp, original_temp_rgb[3];
+  gfloat      intended_temp, intended_temp_rgb[3];
+  gfloat      coefs[3];
+  glong       i;
+
+  in_pixel = in_buf;
+  out_pixel = out_buf;
+
+  original_temp = o->original_temp;
+  intended_temp = o->intended_temp;
+  
+  convert_k_to_rgb (original_temp, original_temp_rgb);
+  convert_k_to_rgb (intended_temp, intended_temp_rgb);
+  
+  coefs[0] = original_temp_rgb[0] / intended_temp_rgb[0]; 
+  coefs[1] = original_temp_rgb[1] / intended_temp_rgb[1]; 
+  coefs[2] = original_temp_rgb[2] / intended_temp_rgb[2]; 
+
+  for (i = 0; i < n_pixels; i++)
+    {
+      out_pixel[0] = in_pixel[0] * coefs[0];
+      out_pixel[1] = in_pixel[1] * coefs[1];
+      out_pixel[2] = in_pixel[2] * coefs[2];
+
+      in_pixel += 4;
+      out_pixel += 4;
+    }
+  return TRUE;
+}
+
+
+static void
+gegl_chant_class_init (GeglChantClass *klass)
+{
+  GeglOperationClass            *operation_class;
+  GeglOperationPointFilterClass *point_filter_class;
+
+  operation_class    = GEGL_OPERATION_CLASS (klass);
+  point_filter_class = GEGL_OPERATION_POINT_FILTER_CLASS (klass);
+
+  point_filter_class->process = process;
+  operation_class->prepare = prepare;
+
+  operation_class->name        = "color-temperature";
+  operation_class->categories  = "color";
+  operation_class->description =
+        "Allows changing the color temperature of an image.";
+}
+
+/* linear RGB coordinates of the range 1000K-12000K of the Planckian locus
+ * with a step of 20K. Original CIE-xy data from
+ *
+ * http://www.aim-dtp.net/aim/technology/cie_xyz/k2xy.txt
+ *
+ * converted to the linear RGB space assuming the ITU-R BT.709-5/sRGB primaries
+ */
+gfloat planckian_locus[][3] = {
+{4.600356578826904, 0.039673976600170, -0.090084008872509}, 
+{4.529547214508057, 0.060751978307962, -0.090336769819260}, 
+{4.460455894470215, 0.081308871507645, -0.090486899018288}, 
+{4.393052101135254, 0.101353414356709, -0.090532697737217}, 
+{4.327302455902100, 0.120895706117153, -0.090473271906376}, 
+{4.263172149658203, 0.139945656061172, -0.090306982398033}, 
+{4.200626373291016, 0.158513724803925, -0.090033084154129}, 
+{4.139626502990723, 0.176611170172691, -0.089650854468346}, 
+{4.080136775970459, 0.194248676300049, -0.089159496128559}, 
+{4.022119522094727, 0.211437240242958, -0.088558793067932}, 
+{3.965537071228027, 0.228188246488571, -0.087848260998726}, 
+{3.910352706909180, 0.244512572884560, -0.087028004229069}, 
+{3.856527805328369, 0.260421544313431, -0.086097948253155}, 
+{3.804027318954468, 0.275925725698471, -0.085058398544788}, 
+{3.752812623977661, 0.291036576032639, -0.083909429609776}, 
+{3.702850103378296, 0.305764228105545, -0.082651883363724}, 
+{3.654103517532349, 0.320119321346283, -0.081285811960697}, 
+{3.606539249420166, 0.334112167358398, -0.079812526702881}, 
+{3.560122966766357, 0.347752898931503, -0.078232251107693}, 
+{3.514821767807007, 0.361051410436630, -0.076546311378479}, 
+{3.470603942871094, 0.374017328023911, -0.074755765497684}, 
+{3.427437543869019, 0.386660069227219, -0.072861269116402}, 
+{3.385292530059814, 0.398988872766495, -0.070864379405975}, 
+{3.344139337539673, 0.411012589931488, -0.068766348063946}, 
+{3.303948402404785, 0.422740101814270, -0.066568255424500}, 
+{3.264692068099976, 0.434179782867432, -0.064271673560143}, 
+{3.226344108581543, 0.445339679718018, -0.061878167092800}, 
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+#endif
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