diff --git a/lisp/image.el b/lisp/image.el
index 82e01624889..c34db68a44a 100644
--- a/lisp/image.el
+++ b/lisp/image.el
@@ -102,7 +102,7 @@ AUTODETECT can be
 	    (see `image-type-available-p').")
 
 (defvar image-format-suffixes
-  '((image/x-icon "ico"))
+  '((image/x-rgb "rgb") (image/x-icon "ico"))
   "An alist associating image types with file name suffixes.
 This is used as a hint by the ImageMagick library when detecting
 the type of image data (that does not have an associated file name).
diff --git a/src/image.c b/src/image.c
index b5b713c9061..a87dc4d4737 100644
--- a/src/image.c
+++ b/src/image.c
@@ -8540,6 +8540,14 @@ imagemagick_load_image (struct frame *f, struct image *img,
     status = MagickReadImage (image_wand, filename);
   else
     {
+      Lisp_Object lwidth = image_spec_value (img->spec, QCwidth, NULL);
+      Lisp_Object lheight = image_spec_value (img->spec, QCheight, NULL);
+
+      if (NATNUMP (lwidth) && NATNUMP (lheight))
+	{
+	  MagickSetSize (image_wand, XFASTINT (lwidth), XFASTINT (lheight));
+	  MagickSetDepth (image_wand, 8);
+	}
       filename_hint = imagemagick_filename_hint (img->spec, hint_buffer);
       MagickSetFilename (image_wand, filename_hint);
       status = MagickReadImageBlob (image_wand, contents, size);