Transform all png images in a directory to jpg

png_to_jpg.py

# Transform png image to jpg
imgs = []
path = "/path/containing/png/files"
valid_images = [".png"]
for f in os.listdir(path):
	ext = os.path.splitext(f)[1]
	if ext.lower() not in valid_images:
		continue
	imgs.append({
		'name': f,
		'file': Image.open(os.path.join(path,f))
	})
for i in imgs:
	file = i['file']
	name = i['name']
	# Has alpha channel
	if file.mode == 'RGBA':
		bg = Image.new('RGB', file.size, (255, 255, 255))
		bg.paste(file, mask=file.split()[3])
		bg.save( os.path.splitext(name)[0] + '.jpg', 'JPEG', quality=95)
	# Doesn't have alpha channel
	else:
		bg.save( os.path.splitext(name)[0] + '.jpg', 'JPEG', quality=95)
	# Remove PNG file
	os.remove(os.path.join(path, name))