how can i write a PIL image object to response

[hywang]

django do it like this:

from django.utils.httpwrappers import HttpResponse
from PIL import Image
def image(request):
image = Image.new("RGB", (800, 600))
response = HttpResponse(mimetype="image/png")
image.save(response, "PNG")
return response


in web2py, I did it with a file, first i save image to a file:
image.save("outut.png", "png")
then stream it:
return response.stream("output.png")

is there anyway like this to do it in web2py ?
thanks!

[mdipierro]

You can do it like in django:

from PIL import Image
def image():

image = Image.new("RGB", (800, 600))

response.headers['Content-Type']="image/png"
image.save(response.body, "PNG")
return response.body.getvalue()

response.body is a StringIO

[Tim Michelsen]

mdipierro:

> You can do it like in django:
>
> from PIL import Image
> def image():
> image = Image.new("RGB", (800, 600))
> response.headers['Content-Type']="image/png"
> image.save(response.body, "PNG")
> return response.body.getvalue()
>
> response.body is a StringIO

Here is a matplotlib based version:

# CONTROLLER:

def image_mat():
import sys
import matplotlib
matplotlib.use('Agg')
from pylab import plot, savefig
plot([1,2,3])
response.headers['Content-Type']="image/png"
savefig(response.body)

return response.body.getvalue()

# view

<img src="{{=URL(r=request,f='image_mat')}}"/>

=> this can be extended for interactive plotting using
* form as input
* numpy /scipy as support for the math

@Massimo
You may add this to the examples.

[张峥]

@Massimo

I also need a example, matplotlib in the web2py, thanks

Tim Michelsen 写道:

[mdipierro]

Very useful! I need this myself. Thanks

Massimo

[M.C. Botha]

This does not work on appengine, there is no save method.

What is the appengine way of doing this?

[Leonel Câmara]

I think Image.save is available in GAE, I don't use it but I see lots of code examples on the web using Image.save with GAE. Anyway, you can use Image.tobytes(encoder_name='PNG') and write that to response.body.