[Image-SIG] create image-instances from data strings

[Torsten Gallmeister]

I need to change only data: I get the data from LDAP and I want to change the
size and palette and then create an ZOPE - image object from that data.Now,
after reading the reply from Joerg Baumann I used two StringIO objects, one for
reading LDAP data and one for saving changes.
The result is now better. But only resizing is o.k. . The palette-manipulations
I get only in a saved file with Image.save("img.jpg").

I use Python 1.5.2 and PIL 1.1 too.
my code is :

# photo are dats from LDAP
 readfile=StringIO.StringIO(photo)
 witefile=StringIO.StringIO()

  im=Image.open(readfile)
  b,h=im.size
  im=im.convert("L").convert("RGB")
  im=im.resize((b*height/h,height))
  im=im.convert("L").convert("P")
# put a new palette area
  im.putpalette(palette)
# this imagedata are only resized
  im.convert("RGB").save(writefile,"JPEG")
# and here is all ok
  im.convert("RGB").save("img.jpg")
  dats=writefile.getvalue()

# ZOPE -> create the Zope-Image obj
  ph=OFS.Image.Image('photo.jpg','Photo',dats)
 self.local_images._setObject('photo.jpg',ph)



> Torsten wrote:
> > Cool, that works but only for the open method. Image.save(file) and getting
> > values with file.getvalue() gives me the initial data of der StringIO
> > object.
>
> what initial data? (a new StringIO object has no content).
>
> here's an example cut and pasted from a terminal window
> (using Python 1.5.2, PIL 1.1):
>
> >>> import Image
> >>> im = Image.open("/images/lenna.im")
> >>> import StringIO
> >>> file = StringIO.StringIO()
> >>> im.save(file, "JPEG")
> >>> data = file.getvalue()
> >>> len(data)
> 29921
> >>> repr(data[:10])
> "'\\377\\330\\377\\340\\000\\020JFIF'"
>
> </F>