[gegl] color-exchange: propagate space

[Øyvind "pippin" Kolås <ok src gnome org>]

commit bfc3c22694a7a6d980eb365c886baed4b682baca
Author: Øyvind Kolås <pippin gimp org>
Date:   Fri Jul 6 11:14:54 2018 +0200

    color-exchange: propagate space

 operations/common-gpl3+/color-exchange.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/operations/common-gpl3+/color-exchange.c b/operations/common-gpl3+/color-exchange.c
index 85f50cf4b..91255cd8b 100644
--- a/operations/common-gpl3+/color-exchange.c
+++ b/operations/common-gpl3+/color-exchange.c
@@ -65,8 +65,9 @@ static void
 prepare (GeglOperation *operation)
 {
   GeglProperties *o      = GEGL_PROPERTIES (operation);
-  const Babl     *format = babl_format ("R'G'B'A float");
-  const Babl     *colorformat = babl_format ("R'G'B' float");
+  const Babl     *space  = gegl_operation_get_source_space (operation, "input");
+  const Babl     *format = babl_format_with_space ("R'G'B'A float", space);
+  const Babl     *colorformat = babl_format_with_space ("R'G'B' float", space);
   CeParamsType *params;
   gfloat        color_in[3];
   gfloat        color_out[3];