diff --git a/README.md b/README.md
index 6a45862..a9a2eff 100644
--- a/README.md
+++ b/README.md
@@ -66,7 +66,6 @@ some more practical uses would be things like:
 * add Bitsy HD and Bitsy 7.0 test data
 * fix variables/endings becoming "DLG DLG"?
 * dedupe "animation frames from string" functionality
-* handle NaN in images (convert to 0? investigate)
 
 ### tidy up
 
diff --git a/src/image.rs b/src/image.rs
index 38d7edd..77bf829 100644
--- a/src/image.rs
+++ b/src/image.rs
@@ -7,6 +7,7 @@ impl From<String> for Image {
     #[inline]
     fn from(string: String) -> Image {
         let string = string.replace("\n", "");
+        let string = string.replace("NaN", "0");
         let pixels: Vec<&str> = string.split("").collect();
         // the above seems to add an extra "" at the start and end of the vec, so strip them below
         let pixels = &pixels[1..(pixels.len() - 1)];