diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..9e121d3
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,3 @@
+[0.9.0.0]
+
+- Added negative levels option
\ No newline at end of file
diff --git a/current_version.txt b/current_version.txt
index a83f796..ef3d8e2 100644
--- a/current_version.txt
+++ b/current_version.txt
@@ -1 +1 @@
-0.8.13.0
\ No newline at end of file
+0.9.0.0
\ No newline at end of file
diff --git a/leaf.php b/leaf.php
index 7cfcc2d..d2d1484 100644
--- a/leaf.php
+++ b/leaf.php
@@ -3,7 +3,7 @@
 // Leaf - Tools for Book Scans
 // No license, do not distribute
 
-$version = "0.8.13";
+$version = "0.9.0.0";
 $time_start = microtime(true);
 date_default_timezone_set("America/Los_Angeles");
 
@@ -76,6 +76,17 @@ function levels_ps_to_imgk($string) {
 		}
 	}
 
+function olevels_ps_to_imgk($string) {
+	$parts = explode(",", $string);
+	if (count($parts) != 2) {
+		msg("Invalid levels string",1);
+		} else {
+		$black = (number_format(($parts[0]/253),5)*100)."%";
+		$white = (number_format(($parts[1]/255),5)*100)."%";
+		return $black.",".$white;
+		}
+	}
+
 function unsharp_ps_to_imgk($string) {
 	$parts = explode(",", $string);
 	if (count($parts) != 3) {
@@ -180,6 +191,8 @@ function args($query) {
 		return levels_ps_to_imgk($opt['levels']);
 		} elseif ($query == "plevels" && isset($opt['plevels'])) {
 		return levels_ps_to_imgk($opt['plevels']);
+		} elseif ($query == "olevels" && isset($opt['olevels'])) {
+		return olevels_ps_to_imgk($opt['olevels']);
 		} elseif ($query == "unsharp" && isset($opt['unsharp'])) {
 		return unsharp_ps_to_imgk($opt['unsharp']);
 		} elseif (isset($opt[$query])) {
@@ -865,7 +878,12 @@ foreach ($jpg as $parts) {
 		$msg .= " (".args("levels").")";
 		$cmd .= "-level ".args("levels")." ";
 		}
-	
+
+	if (args("olevels")) {
+		$msg .= " (".args("olevels").")";
+		$cmd .= "+level ".args("olevels")." ";
+		}
+
 	if (args("unsharp")) {
 		$msg .= " (".args("unsharp").")";
 		$cmd .= "-unsharp ".args("unsharp")." ";