Image resize utility

misago/utils/avatars.py

@@ -1,11 +1,11 @@
 from django.conf import settings
 try:
-    import PIL
+    from PIL import Image
     has_pil = True
 except ImportError:
     has_pil = False
-avatar_sizes = {}
 
+avatar_sizes = {}
 def avatar_size(size):
     if not has_pil:
         return None
@@ -16,4 +16,29 @@ def avatar_size(size):
         for i in settings.AVATAR_SIZES[1:]:
             if size <= i:
                 avatar_sizes[size] = i
-    return avatar_sizes[size]
+    return avatar_sizes[size]
+
+
+def resizeimage(image, size, target):
+    if isinstance(image, basestring):
+        image = Image.open(image)
+    info = image.info
+    format = image.format
+    if format in "GIF":
+        if 'transparency' in info:
+            image = image.resize((size, size), Image.ANTIALIAS)
+            image.save(target, image.format, transparency=info['transparency'])
+        else:
+            image = image.convert("RGB")
+            image = image.resize((size, size), Image.ANTIALIAS)
+            image = image.convert('P', palette=Image.ADAPTIVE)
+            image.save(target, image.format)
+    if format in "PNG":
+        image = image.resize((size, size), Image.ANTIALIAS)
+        image.save(target, quality=95)
+    if format == "JPEG":
+        image = image.convert("RGB")
+        image = image.resize((size, size), Image.ANTIALIAS) 
+        image = image.convert('P', palette=Image.ADAPTIVE)
+        image = image.convert("RGB", dither=None)
+        image.save(target, image.format, quality=95)