Bug 492048 - Detect color space in Exif 2.21/DCF 2.0 option files

Add flag GIMP_METADATA_LOAD_COLORSPACE which defaults to TRUE, and in
gimp_image_metadata_load_finish(), assign AdobeRGB to the image if
Exif.Iop.InteroperabilityIndex says "R03". This is most likely very
incomplete because there are quite some other colorspace tags in
various parts of the image metadata.

libgimp/gimpmetadata.c

@@ -175,6 +175,32 @@ gimp_image_metadata_load_finish (gint32                 image_ID,
                                         metadata, interactive);
     }
 
+  if (flags & GIMP_METADATA_LOAD_COLORSPACE)
+    {
+      gchar *value;
+
+      value = gexiv2_metadata_get_tag_interpreted_string (metadata,
+                                                          "Exif.Iop.InteroperabilityIndex");
+
+      if (! g_strcmp0 (value, "R03"))
+        {
+          GimpColorProfile *profile = gimp_image_get_color_profile (image_ID);
+
+          if (! profile)
+            {
+              /* honor the R03 InteroperabilityIndex only if the
+               * image didn't contain an ICC profile
+               */
+              profile = gimp_color_profile_new_adobe_rgb ();
+              gimp_image_set_color_profile (image_ID, profile);
+            }
+
+          g_object_unref (profile);
+        }
+
+      g_free (value);
+    }
+
   gimp_image_set_metadata (image_ID, metadata);
 }
 

libgimpbase/gimpmetadata.h

@@ -29,6 +29,7 @@ typedef enum
   GIMP_METADATA_LOAD_COMMENT     = 1 << 0,
   GIMP_METADATA_LOAD_RESOLUTION  = 1 << 1,
   GIMP_METADATA_LOAD_ORIENTATION = 1 << 2,
+  GIMP_METADATA_LOAD_COLORSPACE  = 1 << 3,
 
   GIMP_METADATA_LOAD_ALL         = 0xffffffff
 } GimpMetadataLoadFlags;