old_contents: from imagekit.specs import ImageSpec
  from imagekit import processors
      
  class ResizeAdminThumbnail(processors.Resize):
      width = 50
      height = 50
      crop = True
      
  class EnhanceSmall(processors.Adjustment):
      contrast = 1.2
      sharpness = 1.1
      
  class DjangoAdminThumbnail(ImageSpec):
      access_as = 'admin_thumbnail'
      processors = [ResizeAdminThumbnail, EnhanceSmall]
  
new_contents: from imagekit.specs import ImageSpec
  from imagekit import processors
      
  class ResizeAdminThumbnail(processors.Resize):
      width = 50
      height = 50
      crop = False
      
  class EnhanceSmall(processors.Adjustment):
      contrast = 1.2
      sharpness = 1.1
      
  class DjangoAdminThumbnail(ImageSpec):
      access_as = 'admin_thumbnail'
      processors = [ResizeAdminThumbnail, EnhanceSmall]
  
subject: scale thumbnail without cropping