[gegl] color-to-alpha[-plus]: update reference hash

[Øyvind Kolås <ok src gnome org>]

commit 8f3f1e36afd4f27196400b5d02978a6f06ab81ae
Author: Øyvind Kolås <pippin gimp org>
Date:   Sat Nov 11 21:31:04 2017 +0100

    color-to-alpha[-plus]: update reference hash

 operations/common-gpl3+/color-to-alpha.c  |    2 +-
 operations/workshop/color-to-alpha-plus.c |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/operations/common-gpl3+/color-to-alpha.c b/operations/common-gpl3+/color-to-alpha.c
index bdd313e..d99038e 100644
--- a/operations/common-gpl3+/color-to-alpha.c
+++ b/operations/common-gpl3+/color-to-alpha.c
@@ -254,7 +254,7 @@ gegl_op_class_init (GeglOpClass *klass)
     "title",       _("Color to Alpha"),
     "categories",  "color",
     "license",     "GPL3+",
-    "reference-hash", "f110613097308e0fe96ac29f54ca4c2e",
+    "reference-hash", "ac91f678c9f6109e4b9255dcbed6f175",
     "description", _("Convert a specified color to transparency, works best with white."),
     "reference-composition", composition,
     NULL);
diff --git a/operations/workshop/color-to-alpha-plus.c b/operations/workshop/color-to-alpha-plus.c
index e7f6f02..d1b32df 100644
--- a/operations/workshop/color-to-alpha-plus.c
+++ b/operations/workshop/color-to-alpha-plus.c
@@ -232,7 +232,7 @@ gegl_op_class_init (GeglOpClass *klass)
     "title",       _("Color to Alpha +"),
     "categories",  "color",
     "license",     "GPL3+",
-    "reference-hash", "f110613097308e0fe96ac29f54ca4c2e",
+    "reference-hash", "ac91f678c9f6109e4b9255dcbed6f175",
     "description", _("Convert a specified color to transparency, works best with white."),
     "reference-composition", composition,
     NULL);