[Archetypes-users] migrating from PhotoField to ImageField?

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I have a content type that uses PhotoField on Plone 2.5.x.  I want to change 
the field type to ImageField to be able resize images and set the max_size 
with PIL (it does not seem to work with PhotoField)

I tried a test simply swapping the PhotoField for ImageField in my custom 
content's .py file but I recieved an error when trying to view an existing 
content item.  Is it possible to change?  Is there something that needs to 
be done that I am missing?

Traceback (innermost last):
  Module ZPublisher.Publish, line 115, in publish
  Module ZPublisher.mapply, line 88, in mapply
  Module ZPublisher.Publish, line 41, in call_object
  Module Products.CMFFormController.FSControllerPageTemplate, line 90, in 
__call__
  Module Products.CMFFormController.BaseControllerPageTemplate, line 31, in 
_call
  Module Shared.DC.Scripts.Bindings, line 311, in __call__
  Module Shared.DC.Scripts.Bindings, line 348, in _bindAndExec
  Module Products.CMFCore.FSPageTemplate, line 195, in _exec
  Module Products.CacheSetup.patch_cmf, line 28, in FSPT_pt_render
  Module Products.CacheSetup.patch_utils, line 9, in call_pattern
  Module Products.CMFCore.FSPageTemplate, line 134, in pt_render
  Module Products.CacheSetup.patch_cmf, line 74, in PT_pt_render
  Module Products.CacheSetup.patch_utils, line 9, in call_pattern
  Module Products.PageTemplates.PageTemplate, line 104, in pt_render
   - <FSControllerPageTemplate at /myportal/atct_edit used for 
/myportal/Members/halfpass/a-stunning-imported-black-hannoverian>
  Module TAL.TALInterpreter, line 238, in __call__
  Module TAL.TALInterpreter, line 281, in interpret
  Module TAL.TALInterpreter, line 749, in do_useMacro
  Module TAL.TALInterpreter, line 281, in interpret
  Module TAL.TALInterpreter, line 457, in do_optTag_tal
  Module TAL.TALInterpreter, line 442, in do_optTag
  Module TAL.TALInterpreter, line 437, in no_tag
  Module TAL.TALInterpreter, line 281, in interpret
  Module TAL.TALInterpreter, line 749, in do_useMacro
  Module TAL.TALInterpreter, line 281, in interpret
  Module TAL.TALInterpreter, line 457, in do_optTag_tal
  Module TAL.TALInterpreter, line 442, in do_optTag
  Module TAL.TALInterpreter, line 437, in no_tag
  Module TAL.TALInterpreter, line 281, in interpret
  Module TAL.TALInterpreter, line 780, in do_defineSlot
  Module TAL.TALInterpreter, line 281, in interpret
  Module TAL.TALInterpreter, line 457, in do_optTag_tal
  Module TAL.TALInterpreter, line 442, in do_optTag
  Module TAL.TALInterpreter, line 437, in no_tag
  Module TAL.TALInterpreter, line 281, in interpret
  Module TAL.TALInterpreter, line 728, in do_defineMacro
  Module TAL.TALInterpreter, line 281, in interpret
  Module TAL.TALInterpreter, line 772, in do_defineSlot
  Module TAL.TALInterpreter, line 281, in interpret
  Module TAL.TALInterpreter, line 457, in do_optTag_tal
  Module TAL.TALInterpreter, line 442, in do_optTag
  Module TAL.TALInterpreter, line 437, in no_tag
  Module TAL.TALInterpreter, line 281, in interpret
  Module TAL.TALInterpreter, line 728, in do_defineMacro
  Module TAL.TALInterpreter, line 281, in interpret
  Module TAL.TALInterpreter, line 457, in do_optTag_tal
  Module TAL.TALInterpreter, line 442, in do_optTag
  Module TAL.TALInterpreter, line 437, in no_tag
  Module TAL.TALInterpreter, line 281, in interpret
  Module TAL.TALInterpreter, line 749, in do_useMacro
  Module TAL.TALInterpreter, line 281, in interpret
  Module TAL.TALInterpreter, line 780, in do_defineSlot
  Module TAL.TALInterpreter, line 281, in interpret
  Module TAL.TALInterpreter, line 457, in do_optTag_tal
  Module TAL.TALInterpreter, line 442, in do_optTag
  Module TAL.TALInterpreter, line 437, in no_tag
  Module TAL.TALInterpreter, line 281, in interpret
  Module TAL.TALInterpreter, line 691, in do_loop_tal
  Module TAL.TALInterpreter, line 281, in interpret
  Module TAL.TALInterpreter, line 457, in do_optTag_tal
  Module TAL.TALInterpreter, line 442, in do_optTag
  Module TAL.TALInterpreter, line 437, in no_tag
  Module TAL.TALInterpreter, line 281, in interpret
  Module TAL.TALInterpreter, line 749, in do_useMacro
  Module TAL.TALInterpreter, line 281, in interpret
  Module TAL.TALInterpreter, line 457, in do_optTag_tal
  Module TAL.TALInterpreter, line 442, in do_optTag
  Module TAL.TALInterpreter, line 437, in no_tag
  Module TAL.TALInterpreter, line 281, in interpret
  Module TAL.TALInterpreter, line 749, in do_useMacro
  Module TAL.TALInterpreter, line 281, in interpret
  Module TAL.TALInterpreter, line 507, in do_setLocal_tal
  Module Products.PageTemplates.TALES, line 221, in evaluate
   - URL: file:Archetypes/skins/archetypes/widgets/field.pt
   - Line 53, Column 6
   - Expression: <PythonExpr getMethod and getMethod()>
   - Names:
      {'container': <PloneSite at /myportal>,
       'context': <Premium_Photo_Ad at 
/myportal/Members/halfpass/a-stunning-imported-black-hannoverian>,
       'default': <Products.PageTemplates.TALES.Default instance at 
0x8f3702c>,
       'here': <Premium_Photo_Ad at 
/myportal/Members/halfpass/a-stunning-imported-black-hannoverian>,
       'loop': <Products.PageTemplates.TALES.SafeMapping object at 
0xf37ed2c>,
       'modules': <Products.PageTemplates.ZRPythonExpr._SecureModuleImporter 
instance at 0x8f7828c>,
       'nothing': None,
       'options': {'args': (),
                   'state': 
<Products.CMFFormController.ControllerState.ControllerState object at 
0x1086e2ec>},
       'repeat': <Products.PageTemplates.TALES.SafeMapping object at 
0xf37ed2c>,
       'request': <HTTPRequest, 
URL=http://www.myportal.com/Members/halfpass/a-stunning-imported-black-hannoverian/atct_edit>,
       'root': <Application at >,
       'template': <FSControllerPageTemplate at /myportal/atct_edit used for 
/myportal/Members/halfpass/a-stunning-imported-black-hannoverian>,
       'traverse_subpath': [],
       'user': <PloneUser 'sean>}
  Module Products.PageTemplates.ZRPythonExpr, line 47, in __call__
   - __traceback_info__: getMethod and getMethod()
  Module Python expression "getMethod and getMethod()", line 1, in 
<expression>
  Module Products.Archetypes.ClassGen, line 68, in generatedEditAccessor
  Module Products.Archetypes.Field, line 693, in getRaw
  Module Products.Archetypes.utils, line 159, in mapply
  Module Products.Archetypes.ClassGen, line 58, in generatedAccessor
  Module Products.Archetypes.Field, line 961, in get
  Module Products.Archetypes.Field, line 1035, in _wrapValue
  Module Products.Archetypes.Field, line 955, in _make_file
  Module OFS.Image, line 125, in __init__
  Module OFS.Image, line 504, in _read_data
AttributeError: seek