From 9c9b7148f7fb0dfb8060d2a57f344723efe5542c Mon Sep 17 00:00:00 2001
From: Steve Schwarz <steve@agilitynerd.com>
Date: Mon, 16 Oct 2017 15:55:47 -0500
Subject: [PATCH] Conversion of GIF/PNG to JPEG

---
 pilbox/image.py | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/pilbox/image.py b/pilbox/image.py
index c23ff54..bb23846 100644
--- a/pilbox/image.py
+++ b/pilbox/image.py
@@ -277,6 +277,12 @@ def save(self, **kwargs):
             if opts["quality"] == "keep":
                 save_kwargs["quality"] = "keep"
 
+        if fmt == "JPEG" and self.img.mode == 'P':
+            # Converting old GIF and PNG files to JPEG can raise
+            # IOError: cannot write mode P as JPEG
+            # https://mail.python.org/pipermail/python-list/2000-May/036017.html
+            self.img = self.img.convert("RGB")
+
         try:
             self.img.save(outfile, fmt, **save_kwargs)
         except IOError as e: