diff --git a/pngidat b/pngidat
index a9130aad8..327acd26b 100644
--- a/pngidat
+++ b/pngidat
@@ -1,4 +1,9 @@
 #!/bin/sh
 
-root=`echo $1 | sed -e s/.png$//`
-pngidat.exe < file.png | pigz -d > $root.idat
+for x in $*
+do
+  root=`echo $1 | sed -e s/.png$//`
+  pngidat.exe < $1 | zpipe -d  > $root.idat
+  ls -l $root.idat
+  shift
+done
diff --git a/pngzdat b/pngzdat
new file mode 100755
index 000000000..7631d48ab
--- /dev/null
+++ b/pngzdat
@@ -0,0 +1,9 @@
+#!/bin/sh
+
+for x in $*
+do
+  root=`echo $1 | sed -e s/.png$//`
+  pngidat.exe < $1 > $root.zdat
+  ls -l $root.zdat
+  shift
+done