diff --git a/exv.py b/exv.py
index 9499933..f9cf59d 100755
--- a/exv.py
+++ b/exv.py
@@ -7,6 +7,30 @@ import json
 from os.path import isfile, isdir
 from os import walk
 
+TYPES = [
+        "JPEG",
+        "JPG",
+        "EXV",
+        "CR2",
+        "CRW",
+        "MRW",
+        "TIFF",
+        "TIF",
+        "WEBP",
+        "DNG",
+        "NEF",
+        "FEF",
+        "ARW",
+        "RW2",
+        "SR2",
+        "SRW",
+        "ORF",
+        "PNG",
+        "PGF",
+        "RAF",
+        "PSD",
+        "JP2"
+        ]
 
 def extractor(input_files, start, end, recursive):
     if not isinstance(input_files, type(list())):
@@ -30,7 +54,8 @@ def extractor(input_files, start, end, recursive):
         if isdir(item):
             for (dirpath, dirnames, filenames) in walk(item):
                 for filename in filenames:
-                    files.append("{}/{}".format(dirpath, filename))
+                    if filename.split(".")[-1].upper() in TYPES:
+                        files.append("{}/{}".format(dirpath, filename))
                 if not recursive:
                     break
         else: