Primeira versão do wit.

wit.py

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+import Image, ImageEnhance, os
+from os.path import join
+
+def batch():
+	infolder = os.getcwd()
+	watermark = str(raw_input('Type the watermark\'s file name (including the .png or .jpg): '))
+	if not watermark: watermark = "watermark.png"
+	outfolder = os.getcwd()+"/output/"
+	if not os.path.exists(outfolder): os.makedirs(outfolder)
+	mark_dir = infolder+"/"+watermark
+	mark = Image.open(mark_dir)
+	for root, dir, files in os.walk(infolder):
+		if watermark in files: files.remove(watermark)
+		for name in files:        
+			try:
+				im = Image.open(join(root, name))
+				if im.mode != 'RGBA':
+					im = im.convert('RGBA')
+				layer = Image.new('RGBA', im.size, (0,0,0,0))
+				position = (im.size[0]-(mark.size[0]*2), im.size[1]-(mark.size[1]*2))
+				layer.paste(mark, position)
+				Image.composite(layer, im, layer).save( join(outfolder, name))
+			except Exception, (msg):
+				print ""
+
+if __name__ == '__main__':
+    batch()