palettise: clear the unused part of the palette

diff --git a/src/palettise.rs b/src/palettise.rs
index 2025232cf5a479afdc74d5619fe8369a1b377f70..5342c1c5e4416810bab4d598be915d5e35074251 100644 (file)
--- a/src/palettise.rs
+++ b/src/palettise.rs
@@ -463,6 +463,9 @@ pub fn create_palettiser(enc_opts: &[OptionArgs]) -> Option<Palettiser> {
             _ => {},
         }
     }
+    for clr in pal.iter_mut().skip(nclrs) {
+        *clr = [0; 3];
+    }
     if pmode.is_some() || pal_is_some {
         Some(Palettiser::new(pmode.unwrap_or_default(), &pal, nclrs))
     } else {