diff --git a/src/img2pdf.py b/src/img2pdf.py
index f89670b..76439c3 100755
--- a/src/img2pdf.py
+++ b/src/img2pdf.py
@@ -1832,11 +1832,9 @@ def read_images(
             )
     else:
         logger.debug("PIL format = %s", imgdata.format)
-        imgformat = None
-        for f in ImageFormat:
-            if f.name == imgdata.format:
-                imgformat = f
-        if imgformat is None:
+        try:
+            imgformat = ImageFormat[imgdata.format]
+        except KeyError:
             imgformat = ImageFormat.other
 
     def cleanup():