Dynamic image creation for the web...
Hi,
I would like to create images on the fly as a response to an http request.
I can do this with PIL like this (file create_gif.py):
from PIL import Image, ImageDraw
print 'Status: 200 OK'
print 'Content-type: text/html'
print
print 'Python Dynamic Image Creation Test'
print ''
im = Image.new("P", (600, 400))
draw = ImageDraw.Draw(im)
draw.rectangle((0, 0) + im.size, fill="blue")
im.save("images/tmp.gif");
print ''
print ''
However, I would like to 1) avoid saving the image in a file on disk and
2) separate the HTLM code from the python image creation code.
Something like this is what I have in mind:
(file index.html):
Python Dynamic Image Creation
and in file create_image.py:
from PIL import Image, ImageDraw, ImageFont
im = Image.new("P", (600, 400))
draw = ImageDraw.Draw(im)
draw.rectangle((0, 0) + im.size, fill="blue")
Unfortunately this does not work :-(
What is missing?
Thanks in advance!
/Tompa
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Re: Dynamic image creation for the web...
Benjamin Niemann odahoda.de> writes:
> You are almost there.
I don't feel so...
> Your create_image.py does not return anything to the
> browser yet.
Yes, I am aware of that but I do not what to return.
> First return proper HTTP headers, e.g.
>
> sys.stdout.write('Status: 200 OK\r\n')
> sys.stdout.write('Content-type: image/gif\r\n')
> sys.stdout.write('\r\n')
Ok, but if possible I'd rather not return anything HTTP/HTML-related from my
create_image.py file.
> Then check the PIL docs to find out, how to output the image to sys.stdout
> (instead of writing to a file).
>
Ok, then I get this:
from PIL import Image, ImageDraw
import sys
im = Image.new("P", (600, 400))
draw = ImageDraw.Draw(im)
draw.rectangle((0, 0) + im.size, fill="blue")
sys.stdout.write('Status: 200 OK\r\n')
sys.stdout.write('Content-type: image/gif\r\n')
sys.stdout.write('\r\n')
im.save(sys.stdout, "GIF")
But this does not work.
I also tested to skip the HTTP-header stuff and just write the gif to
sys.stdout, believing that that would work. But not so...
Hmm, I'm a newbie to Python (as you already probably have noticed ;-) so I
don't know what else I should try. Any hints are welcome!
/Tompa
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Re: Dynamic image creation for the web...
Richard Lewis fastmail.co.uk> writes:
> It would be useful to know what web server software you're using.
I intended to add that info but forgot...
I run IIS on W2K, python 2.4.1 and PIL 1.1.5.
> The other thing you may need to check is the HTTP header of the
> generated image.
If possible I'd rather separate the HTTP/HTML-stuff from image creation.
I'd like to have an HTML file that refers to a py-file that creates images
which are returned somehow (sys.stdout or something else in memory) and
incorporated within the HTTP-response.
> It should be possible to create an HTTP response from
> your create_image.py script (as opposed to just an image) with a MIME
> type of image/jpeg and manually insert the binary image data in the
> response body...
Yes, I believe so too. Something like this, as suggested by Benjamin:
sys.stdout.write('Status: 200 OK\r\n')
sys.stdout.write('Content-type: image/gif\r\n')
sys.stdout.write('\r\n')
im.save(sys.stdout, "GIF")
But it does not work for some reason!? Besides, I was hoping for a solution
which could skip the HTTP-header related stuff...
Regards,
/Tompa
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Re: Dynamic image creation for the web...
Max Erickson gmail.com> writes: > > check out sparklines: > > http://bitworking.org/projects/sparklines/ > > It is a script very similar to what you want to do. This sure looks interesting! Strange that I couldn't find this when I googled for this kind of stuff... I will check it out - thanks! Regards, /Tompa -- http://mail.python.org/mailman/listinfo/python-list
