[gegl] shadows-highlights, shadows-highlights-correction: Default to NOP

[Debarshi Ray <debarshir src gnome org>]

commit c2e06ad651ddbca3ab89b9c0c7e1dbb685399383
Author: Debarshi Ray <debarshir gnome org>
Date:   Fri Jan 5 16:38:32 2018 +0100

    shadows-highlights, shadows-highlights-correction: Default to NOP
    
    It is nicer for applications to have the operation start in its NOP
    state as opposed to an arbitrary preset. This way an application
    doesn't need to separately remember the NOP settings when bringing it
    up for the first time.

 .../common-gpl3+/shadows-highlights-correction.c   |    4 ++--
 operations/common-gpl3+/shadows-highlights.c       |    4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/operations/common-gpl3+/shadows-highlights-correction.c 
b/operations/common-gpl3+/shadows-highlights-correction.c
index b65d499..8d4b42d 100644
--- a/operations/common-gpl3+/shadows-highlights-correction.c
+++ b/operations/common-gpl3+/shadows-highlights-correction.c
@@ -26,11 +26,11 @@
 
 #ifdef GEGL_PROPERTIES
 
-property_double (shadows, _("Shadows"), 50.0)
+property_double (shadows, _("Shadows"), 0.0)
     description (_("Adjust exposure of shadows"))
     value_range (-100.0, 100.0)
 
-property_double (highlights, _("Highlights"), -50.0)
+property_double (highlights, _("Highlights"), 0.0)
     description (_("Adjust exposure of highlights"))
     value_range (-100.0, 100.0)
 
diff --git a/operations/common-gpl3+/shadows-highlights.c b/operations/common-gpl3+/shadows-highlights.c
index 7abb385..e4538ba 100644
--- a/operations/common-gpl3+/shadows-highlights.c
+++ b/operations/common-gpl3+/shadows-highlights.c
@@ -25,11 +25,11 @@
 
 #ifdef GEGL_PROPERTIES
 
-property_double (shadows, _("Shadows"), 50.0)
+property_double (shadows, _("Shadows"), 0.0)
     description (_("Adjust exposure of shadows"))
     value_range (-100.0, 100.0)
 
-property_double (highlights, _("Highlights"), -50.0)
+property_double (highlights, _("Highlights"), 0.0)
     description (_("Adjust exposure of highlights"))
     value_range (-100.0, 100.0)