From 6b0f676a5e7ece6a046016fe5c0c3acb915f34c8 Mon Sep 17 00:00:00 2001
From: Dirk Lemstra <dirk@git.imagemagick.org>
Date: Fri, 22 Dec 2017 22:06:11 +0100
Subject: [PATCH] Fixed issue with grayscale images.

---
 libvips/foreign/magicksave.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/libvips/foreign/magicksave.c b/libvips/foreign/magicksave.c
index a9a3c8cc..c057c49f 100644
--- a/libvips/foreign/magicksave.c
+++ b/libvips/foreign/magicksave.c
@@ -94,6 +94,13 @@ magick_set_image_size( Image *image, const size_t width, const size_t height,
 	return SetImageExtent( image, width, height, exception );
 }
 
+static int
+magick_set_image_colorspace( Image *image, const ColorspaceType colorspace,
+	ExceptionInfo *exception)
+{
+	return SetImageColorspace( image, colorspace, exception );
+}
+
 static int
 magick_import_pixels( Image *image, const ssize_t x, const ssize_t y,
 	const size_t width, const size_t height, const char *map,
@@ -143,6 +150,14 @@ magick_set_image_size( Image *image, const size_t width, const size_t height,
 	return SetImageExtent( image, width, height );
 }
 
+static int
+magick_set_image_colorspace( Image *image, const ColorspaceType colorspace,
+	ExceptionInfo *exception)
+{
+	(void) exception;
+	return SetImageColorspace( image, colorspace );
+}
+
 static int
 magick_import_pixels( Image *image, const ssize_t x, const ssize_t y,
 	const size_t width, const size_t height, const char *map,
@@ -350,6 +365,11 @@ magick_create_image( Write *write, VipsImage *im )
 	if( !magick_set_image_size( image, im->Xsize, im->Ysize, write->exception ) )
 		return( -1 );
 
+	if( im->Bands < 3) {
+		if (! magick_set_image_colorspace( image, GRAYColorspace, write->exception ) )
+			return( -1 );
+	}
+
 	write->current_image=image;
 	magick_set_properties( write );
 	status =  vips_sink_disc( im, magick_write_block, write );