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  gheither 11 years ago

  This slice used to work for me about a year ago, now it's not after I upgraded my web2py.  Can anyone get this working with the latest web2py build?

  It creates the thumbnail successfully and stores it in the uploads folder, but when you try to retrieve the thumbnail through the URL bar or the DB admin screen you get a ticket.

  <type 'exceptions.TypeError'> Can't retrieve uploads.thumb.16e0d9fd-bc66-4b36-9c75-03aaea1d8603.PNG

  Please help!
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  eanappi 11 years ago

  I did what I explained and it worked perfect. But when uploading in Amazon EC2 does not work.

   

  There are dependencies to use this module?

  replies (1)

  • villas 11 years ago
    

    Of course, as noted you need PIL to be installed. Check filesystem permissions of the folder that your python/webserver can write files. BTW I like the code by simpel in the comments.

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  write2ariya 12 years ago

  Dear David

   

  This is very useful. I use you code in my project. Thank you for your contribution & sharing.

  (just wanna thanks, I will payback web2py community someway)

  Ariya
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  simpel 14 years ago

  You can do also:

  
  
  class RESIZE(object): 
      def __init__(self,nx=160,ny=80,error_message='niepoprawny plik'): 
          (self.nx,self.ny,self.error_message)=(nx,ny,error_message) 
      def __call__(self,value):
          if isinstance(value, str) and len(value)==0: 
              return (value,None) 
          from PIL import Image 
          import cStringIO 
          try: 
              img = Image.open(value.file) 
              img.thumbnail((self.nx,self.ny), Image.ANTIALIAS) 
              s = cStringIO.StringIO() 
              img.save(s, 'JPEG', quality=100) 
              s.seek(0) 
              value.file = s 
          except: 
              return (value, self.error_message) 
          else: 
              return (value, None)
              
  def THUMB(image, nx=120, ny=120):
      from PIL import Image 
      import os  
      img = Image.open(request.folder + 'uploads/' + image)
      img.thumbnail((nx,ny), Image.ANTIALIAS) 
      root,ext = os.path.splitext(image)
      thumb='%s_thumb%s' %(root, ext)
      img.save(request.folder + 'uploads/' + thumb)
      return thumb
  
  
  db.define_table('gallery',
      Field('image', 'upload', required=True, notnull=True, requires=[IS_IMAGE(), RESIZE(650, 650)]),
      Field('image_thumb', 'upload', compute=lambda r: THUMB(r['image'])))
  
  
  

  Why can't I edit my own comment? Can somebody delete my first comment? Thanks
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  mrfreeze 14 years ago

  I deleted it and will add comment editing. I thought previewing would be enough.
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  mrfreeze 14 years ago

  Done! The only rule is that you have to be the author of the last comment. Thanks.
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  simpel 14 years ago

  Great :) Thanks
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  rppowell 14 years ago

  just wanted to add that the thumbnail image name matters (at least in the current version of web2py). I ended up with this code:

  
  def makeThumbnail(img_name,size=(150,150)):
      try:    
          import os
          from PIL import Image
      except: 
          return
      im=Image.open(request.folder + 'uploads/' + img_name)
      im.thumbnail(size,Image.ANTIALIAS)
      root,ext = os.path.splitext(img_name)
      thumbName='%s_thumb%s' %(root, ext)
      im.save(request.folder + 'uploads/' + thumbName)
      return thumbName
  
  def add():
      form = SQLFORM(db.Item)
      if form.accepts(request.vars, session):
          response.flash = "Item Added"
          row = db(db.Item.id==form.vars.id).select()[0]
          img_name=row.image
          thumb = makeThumbnail(img_name)
          if thumb: row.update_record(image_thumb=thumb)
      elif form.errors:
          response.flash = "Form has errors"
      return dict(form=form)
  

  Does the thumbnail really need a UUID that is not related to the original image?
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  rppowell 14 years ago

  I guess I should put back in the original error checking!
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  villas 14 years ago

  The validator is good for transforming a field, but at the end you just have one image/field. In the case of this slice I wanted to automatically create a thumbnail from an upload which would result in having two files/fields. I think the use case is therefore different. However, it is still good to know this RESIZE validator. Thanks.
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  sherdim 14 years ago

  This solution supposes initial keeping of the uploaded BIG image. I am not a specialist in the webserver memory utilization, but a solution with validator RESIZE, which called on any upload to the given field is more straightforward IMHO. Such solution was published in the web2py group about a year ago. It utilizes PIL also and cStringIO as a temporal buffer. The same approach was for automarking images with the site logo. Place a module with validator in module folder. ================ __all__ = [ 'RESIZE', ] class RESIZE(object): """ Resize image such as thumbnail """ def __init__(self,nx=160,ny=80,error_message='image resize error'): (self.nx,self.ny,self.error_message)=(nx,ny,error_message) def __call__(self,value): if isinstance(value, str) and len(value)==0: return (value,None) from PIL import Image import cStringIO try: #load im=Image.open(value.file) #resize im.thumbnail((self.nx,self.ny),Image.ANTIALIAS) #by hand s=cStringIO.StringIO() im.save(s,'JPEG',quality=86) s.seek(0) value.file=s except: return (value,self.error_message) else: return (value,None) =========== Vale!