diff -uNr GMT4.5.9_orig/src/pslib.c GMT4.5.9/src/pslib.c
--- GMT4.5.9_orig/src/pslib.c	2012-12-19 05:45:55.000000000 +0900
+++ GMT4.5.9/src/pslib.c	2013-01-19 00:29:08.000000000 +0900
@@ -647,8 +647,11 @@
 	/* Colormask or interpolate */
 	it = nx < 0 ? 1 : (nbits < 0 ? 2 : 0);
 
+	/*
 	if (PSL->internal.color_mode != PSL_GRAY && (image = ps_makecolormap (buffer, nx, ny, nbits))) {
+	*/
 		/* Creation of colormap was successful */
+	/*
 		nbits = ps_bitreduce (image->buffer, nx, ny, image->colormap->ncolors);
 
 		if (PSL->internal.comments) fprintf (PSL->internal.fp, "\n%% Start of %s Adobe Indexed %s image [%ld bit]\n", kind[PSL->internal.ascii], colorspace[id], nbits);
@@ -658,13 +661,16 @@
 		ps_stream_dump (image->buffer, nx, ny, nbits, PSL->internal.compress, PSL->internal.ascii, 0);
 		fprintf (PSL->internal.fp, "U\n");
 		if (PSL->internal.comments) fprintf (PSL->internal.fp, "%% End of %s Adobe Indexed %s image\n", kind[PSL->internal.ascii], colorspace[id]);
+	*/
 
 		/* Clear the newly created image buffer and colormap */
+	/*
 		ps_free (image->buffer);
 		ps_free (image->colormap);
 		ps_free (image);
 	}
 	else {
+	*/
 		/* Export full gray scale, RGB or CMYK image */
 		nbits = PSL_abs (nbits);
 
@@ -686,7 +692,9 @@
 		ps_stream_dump (buffer, nx, ny, nbits, PSL->internal.compress, PSL->internal.ascii, 0);
 		fprintf (PSL->internal.fp, "U\n");
 		if (PSL->internal.comments) fprintf (PSL->internal.fp, "%% End of %s Adobe %s image\n", kind[PSL->internal.ascii], colorspace[id]);
+		/*
 	}
+		*/
 }
 
 /* fortran interface */