PIL: how to return a StringIO of an Image

[Christoph]

Hi,

I have a script I pass (from Zope) an image file to, to do some PIL image stuff
with it. I want a StringIO instance representing the altered image file to be
returned. What is the method to get the image data (header and pixel data)? I
tried Image.tostring(), but that only returns the pixle data. But to be able to
use the returned data in Zope as an image file (manage_addImage, in case someone
cares), I need the complete representation of the. file.

Here’s some code:

def modify_image(self, my_image):
from PIL import Image
from StringIO import StringIO

image=Image.open(my_image)
. # do some PIL

[Fredrik Lundh]

"Christoph" wrote:

image.save('test', 'JPEG')
image=StringIO(image.????()) # what's the right method?
return image

Any hints? Thanx!

file = StringIO()
image.save(file, "JPEG")
return file.getvalue()

</F>

[Christoph]

Fredrik Lundh schrieb:

image.save('test', 'JPEG')
image=StringIO(image.????()) # what's the right method?
return image

Any hints? Thanx!

file = StringIO()
image.save(file, "JPEG")
return file.getvalue()

That's what I wanted. Perfect!
Thanx a lot!
Christoph

[Bengt Richter]

On Fri, 14 Nov 2003 16:45:39 +0100, "Fredrik Lundh" <fr*****@pythonware.com> wrote:

"Christoph" wrote:

image.save('test', 'JPEG')
image=StringIO(image.????()) # what's the right method?
return image

Any hints? Thanx!

file = StringIO()
image.save(file, "JPEG")
return file.getvalue()

You are recommending shadowing 'file' ?!

Regards,
Bengt Richter

[JCM]

Bengt Richter <bo**@oz.net> wrote:

On Fri, 14 Nov 2003 16:45:39 +0100, "Fredrik Lundh" <fr*****@pythonware.com> wrote:

"Christoph" wrote:

image.save('test', 'JPEG')
image=StringIO(image.????()) # what's the right method?
return image

Any hints? Thanx!

file = StringIO()
image.save(file, "JPEG")
return file.getvalue()

You are recommending shadowing 'file' ?!

Why not? Python is a block-structured language. New builtins can
arrive in any release.

[Bengt Richter]

On Fri, 14 Nov 2003 20:38:43 +0000 (UTC), JCM <jo******************@myway.com> wrote:

Bengt Richter <bo**@oz.net> wrote:

On Fri, 14 Nov 2003 16:45:39 +0100, "Fredrik Lundh" <fr*****@pythonware.com> wrote:

"Christoph" wrote:

image.save('test', 'JPEG')
image=StringIO(image.????()) # what's the right method?
return image

Any hints? Thanx!

file = StringIO()
image.save(file, "JPEG")
return file.getvalue()

You are recommending shadowing 'file' ?!

Why not? Python is a block-structured language. New builtins can
arrive in any release.

I'd say a reason is to avoid the time you will do it by habit and get a surprise.
But yes, there's no technical reason you can't, if you don't want to use the original
binding in that scope.

Regards,
Bengt Richter