# HG changeset patch
# User Carnë Draug <carandraug@octave.org>
# Date 1376711061 -3600
# Node ID b1a09f72a520f556284544be525ceeb106e11a00
# Parent  53f1d5bb58bcdbce7424afcf893ed55c0866e138
imwrite: fix input checking for colormap (bug #39791)

diff --git a/scripts/image/private/__imwrite__.m b/scripts/image/private/__imwrite__.m
--- a/scripts/image/private/__imwrite__.m
+++ b/scripts/image/private/__imwrite__.m
@@ -26,14 +26,16 @@
 
   if (nargin < 2 || ! (isnumeric (img) || islogical (img)))
     print_usage ("imwrite");
-  elseif (isempty (img))
+  endif
+
+  [filename, ext, map, param_list] = imwrite_filename (varargin{:});
+
+  if (isempty (img))
     error ("imwrite: invalid empty image");
   elseif (issparse (img) || issparse (map))
     error ("imwrite: sparse images are not supported");
   endif
 
-  [filename, ext, map, param_list] = imwrite_filename (varargin{:});
-
   if (rem (numel (param_list), 2) != 0)
     error ("imwrite: no pair for all arguments (odd number left)");
   endif