diff -ur pureimage-0.1.0.orig/lib/pureimage.rb pureimage-0.1.0/lib/pureimage.rb
--- pureimage-0.1.0.orig/lib/pureimage.rb	Fri Jul 22 02:16:25 2005
+++ pureimage-0.1.0/lib/pureimage.rb	Sun Jul 31 16:48:23 2005
@@ -604,14 +604,8 @@
 
   SIGNATURE = "\x89PNG\x0d\x0a\x1a\x0a"
 
-  def save(image, file)
-    begin
-      outp = File.new(file, "w")
-      outp.binmode
-    rescue
-      raise "Cannot open PNG file: " + file
-    end
-    begin
+  def write(image, outp)
+      outp.binmode if outp.respond_to? "binmode"
       # PNG file signature
       outp.write(SIGNATURE)
       # IHDR image header
@@ -631,6 +625,16 @@
       write_chunk(outp, "IDAT", data)
       # IEND end
       write_chunk(outp, "IEND", "")
+  end
+
+  def save(image, file)
+    begin
+      outp = File.new(file, "w")
+    rescue
+      raise "Cannot open PNG file: " + file
+    end
+    begin
+      write(image, outp)
     rescue
       raise "Cannot write PNG file: " + file
     ensure