fix to vips_grey() --uchar

ChangeLog

@@ -1,3 +1,6 @@
+6/3/14 started 7.38.6
+- grey ramp minimum was wrong
+
 24/2/14 started 7.38.5
 - jpeg load from buffer could write to input, thanks Lovell
 - fix webpload from buffer, thanks Lovell

configure.ac

@@ -2,7 +2,7 @@
 
 # also update the version number in the m4 macros below
 
-AC_INIT([vips], [7.38.5], [vipsip@jiscmail.ac.uk])
+AC_INIT([vips], [7.38.6], [vipsip@jiscmail.ac.uk])
 # required for gobject-introspection
 AC_PREREQ(2.62)
 
@@ -17,7 +17,7 @@ AC_CONFIG_MACRO_DIR([m4])
 # user-visible library versioning
 m4_define([vips_major_version], [7])
 m4_define([vips_minor_version], [38])
-m4_define([vips_micro_version], [5])
+m4_define([vips_micro_version], [6])
 m4_define([vips_version],
           [vips_major_version.vips_minor_version.vips_micro_version])
 
@@ -37,7 +37,7 @@ VIPS_VERSION_STRING=$VIPS_VERSION-`date`
 #   binary interface changes not backwards compatible?: reset age to 0
 
 LIBRARY_CURRENT=37
-LIBRARY_REVISION=4
+LIBRARY_REVISION=5
 LIBRARY_AGE=0
 
 # patched into include/vips/version.h

libvips/create/grey.c

@@ -89,6 +89,8 @@ vips_grey_class_init( VipsGreyClass *class )
 	vobject_class->description = _( "make a grey ramp image" );
 
 	point_class->point = vips_grey_point;
+	point_class->min = 0.0; 
+	point_class->max = 1.0; 
 }
 
 static void