from io import BytesIO
from django.core.files.uploadedfile import InMemoryUploadedFile
from sys import getsizeof

image = self.cleaned_data.get("image")
if not image:
    image = ''
    return image
size = (145,145)

im = Image.open(image)
output = BytesIO()
im.thumbnail(size)
im.save(output, format='JPEG', quality=100)
output.seek(0)

image = InMemoryUploadedFile(output,'ImageField', "%s.jpg" %image.name.split('.')[0], 'image/jpeg', getsizeof(output), None)

return image