Can someone explain how to use the height_field and width_field for an
ImageField as it would relate to this model:

class ProductImage(models.Model):
  image = models.ImageField(upload_to='images')

The explanation in the documentation is:
Name of a model field which will be auto-populated with the height of
the image each time the model instance is saved.

I don't think that's 100% clear.  At least to me its not.  I tried
this:

class ProductImage(models.Model):
  height = models.IntegerField()
  width = models.IntegerField()
  image = models.ImageField(upload_to='images', height_field=height,
width_field=width)

Must I do anything else specific with my model or am I way off?
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