diff -ruN vmd_orig/configure vmd/configure
--- vmd_orig/configure	Sun Jul 13 21:15:48 2003
+++ vmd/configure	Sun Jul 13 21:18:06 2003
@@ -927,6 +927,7 @@
 		   'PlainTextInterp.C',
 		   'PluginMgr.C',
 		   'POV3DisplayDevice.C', 
+		   'PNGDisplayDevice.C', 
 		   'PSDisplayDevice.C', 
 	  	   'VMDQuat.C',
 		   'RadianceDisplayDevice.C', 
@@ -1045,6 +1046,7 @@
 	      'PluginMgr.h',
 	      'PointerTool.h', 
 	      'POV3DisplayDevice.h', 
+	      'PNGDisplayDevice.h', 
 	      'PSDisplayDevice.h', 
 	      'VMDQuat.h',
 	      'RadianceDisplayDevice.h', 
@@ -1800,7 +1802,7 @@
 @DEFINES  = ();
 @INCDIRS  = ();
 @LIBDIRS  = ();
-@LIBS     = ();
+@LIBS     = ("-lpng");
 @VMD_CCPP = ();
 @VMD_CC   = ();
 @VMD_H    = ();
diff -ruN vmd_orig/src/FileRenderList.C vmd/src/FileRenderList.C
--- vmd_orig/src/FileRenderList.C	Sun Jul 13 21:15:40 2003
+++ vmd/src/FileRenderList.C	Sun Jul 13 21:23:23 2003
@@ -46,6 +46,7 @@
 #include "RenderManDisplayDevice.h"   // RenderMan interface
 #include "VrmlDisplayDevice.h"        // VRML 1.0 
 #include "Vrml2DisplayDevice.h"       // VRML 2.0 
+#include "PNGDisplayDevice.h"         // PNG
 
 #if defined(VMDLIBTACHYON) 
 #include "LibTachyonDisplayDevice.h"  // Built-in Tachyon ray tracer
@@ -68,6 +69,7 @@
   add(new RadianceDisplayDevice());
   add(new R3dDisplayDevice());
   add(new VrmlDisplayDevice());
+  add(new PNGDisplayDevice(app->display));
 }
 
 // destructor, deallocate all the info
diff -ruN vmd_orig/src/PNGDisplayDevice.C vmd/src/PNGDisplayDevice.C
--- vmd_orig/src/PNGDisplayDevice.C	Wed Dec 31 19:00:00 1969
+++ vmd/src/PNGDisplayDevice.C	Sun Jul 13 21:26:00 2003
@@ -0,0 +1,103 @@
+
+/***************************************************************************
+ *cr                                                                       
+ *cr            (C) Copyright 1995-2003 The Board of Trustees of the           
+ *cr                        University of Illinois                       
+ *cr                         All Rights Reserved                        
+ *cr                                                                   
+ ***************************************************************************/
+
+/***************************************************************************
+ * RCS INFORMATION:
+ *
+ *      $RCSfile: PNGDisplayDevice.C,v $
+ *      $Author: brad noyes $        $Locker:  $             $State: Exp $
+ *      $Revision: 1.2 $       $Date: 2003/06/19 18:16:50 $
+ *
+ ***************************************************************************
+ * DESCRIPTION:
+ *
+ *
+ ***************************************************************************/
+#include <libpng/png.h>
+#include <GL/gl.h>
+#include <stdlib.h>
+#include "PNGDisplayDevice.h"
+#include "Inform.h"
+void user_error_fn (png_structp png_ptr, const char *message)
+{
+    msgErr << "png Error" << sendmsg;
+}
+
+void user_warning_fn (png_structp png_ptr, const char *message)
+{
+    msgInfo << "png Warning" << sendmsg;
+}
+void write_row_callback(png_structp png_ptr, png_uint_32 row, int pass)
+{
+    msgInfo << "Writing row [" << pass <<"] " << sendmsg;
+}
+
+
+
+PNGDisplayDevice::PNGDisplayDevice(DisplayDevice *d) : 
+  FileRenderer("png", "snap.png", "gimp %s") 
+{
+  display = d; 
+}
+
+int PNGDisplayDevice::open_file(const char * filename)
+{
+  if ((outfile = fopen(filename, "wb")) == NULL) {
+    msgErr << "Could not open file " << filename
+           << " in current directory for writing!" << sendmsg;
+    return FALSE;
+  }
+  my_filename = stringdup(filename);
+  isOpened = TRUE;
+  return TRUE;
+}
+
+
+void PNGDisplayDevice::render(const VMDDisplayList *)
+{
+    int r;
+    int height = display->ySize;
+    int width = display->xSize;
+    int depth = 8;
+    GLubyte* buffer;
+    png_structp png_ptr = png_create_write_struct (PNG_LIBPNG_VER_STRING, 
+                            NULL, user_error_fn, user_warning_fn);
+    png_infop info_ptr = png_create_info_struct(png_ptr);
+
+    if (setjmp(png_jmpbuf(png_ptr)))
+    {
+        png_destroy_write_struct(&png_ptr, &info_ptr);
+        return;
+    }
+
+    png_init_io(png_ptr, outfile);
+    png_set_IHDR(png_ptr, info_ptr, width, height, depth,PNG_COLOR_TYPE_RGB,PNG_INTERLACE_NONE,PNG_COMPRESSION_TYPE_DEFAULT,PNG_FILTER_TYPE_DEFAULT);
+    buffer = (GLubyte*)malloc (width * 3 * sizeof (unsigned char));
+    msgInfo << "Height=" <<height<<"  Width="<<width<<sendmsg;
+    png_write_info(png_ptr, info_ptr);
+
+    for (r = height - 1; r >= 0; r--) 
+    {
+        glReadPixels (0, r, width, 1, GL_RGB, GL_UNSIGNED_BYTE, buffer);
+        png_write_row (png_ptr, (png_bytep) buffer);
+    }
+    png_write_end (png_ptr, NULL);
+    png_destroy_write_struct (&png_ptr, &info_ptr);
+    free(buffer);
+
+}
+
+void PNGDisplayDevice::close_file(void)
+{
+    fclose(outfile);
+    outfile = NULL;
+    delete [] my_filename;
+    my_filename = NULL;
+    isOpened = FALSE;
+}
diff -ruN vmd_orig/src/PNGDisplayDevice.h vmd/src/PNGDisplayDevice.h
--- vmd_orig/src/PNGDisplayDevice.h	Wed Dec 31 19:00:00 1969
+++ vmd/src/PNGDisplayDevice.h	Sun Jul 13 21:18:37 2003
@@ -0,0 +1,44 @@
+/***************************************************************************
+ *cr                                                                       
+ *cr            (C) Copyright 1995-2003 The Board of Trustees of the           
+ *cr                        University of Illinois                       
+ *cr                         All Rights Reserved                        
+ *cr                                                                   
+ ***************************************************************************/
+
+/***************************************************************************
+ * RCS INFORMATION:
+ *
+ *      $RCSfile: PNGDisplayDevice.h,v $
+ *      $Author: brad noyes $       $Locker:  $             $State: Exp $
+ *      $Revision: 1.2 $       $Date: 2003/06/19 18:16:50 $
+ *
+ ***************************************************************************
+ * DESCRIPTION:
+ *
+ *
+ ***************************************************************************/
+
+
+#ifndef PNGDISPLAYDEVICE_H
+#define PNGDISPLAYDEVICE_H
+
+#include "FileRenderer.h"
+
+class PNGDisplayDevice : public FileRenderer {
+private:
+  DisplayDevice *display;
+public:
+
+  PNGDisplayDevice(DisplayDevice *);
+
+  virtual int open_file(const char *filename);
+
+  // ignore the renders
+  virtual void render(const VMDDisplayList*);
+
+  virtual void close_file(void);
+
+};
+
+#endif