[reportlab-users] Generate a Jpeg image from a PDF File done by reportlab

[Carl Karsten]

On Wed, Dec 2, 2009 at 10:07 AM, Dani Reguera <drbakhache at gmail.com> wrote:

> Hi everybody,

>

> I have a problem with a pdf file generated with reportlab, maybe anyone

> could help me. I have generated a file in reportlab, and now I want to make

> a thumbnail image, the format doesn't  matter (png or jpeg) and I'm trying

> with ghostscript (GS) and ImageMagick, but the problem is that GS tells me

> that it's and error. Seems that the pdf generated by reportlab is

> corrupted... could be that the pdf format is PDF-1.3?

>

> Is in reportlab a way to generate a jpg image or export apdf file to a jpg

> image?

>

> Any suggestion or help will be appreciated.

>


it is easier if you create files, but here is how I do it all in memory:

    # get pdf
    pdf = mkpdf(ds,sample=True)

    # render pdf onto pixbuf
    pixbuf = Pixbuf(COLORSPACE_RGB,False,8,286,225)
    doc = poppler.document_new_from_data(pdf,len(pdf),password='')
    page0=doc.get_page(0)
    page0.render_to_pixbuf(0,0,8,11,1,0,pixbuf)

    # save pixbuf as png
    # There has to be a better way to get the image?
    lst=[]
    pixbuf.save_to_callback(lambda b,l: l.append(b), 'png', user_data=lst)
    png=''.join(lst)

    return png


http://bazaar.launchpad.net/~mdipierro/web2conf/devel/annotate/head%3A/controllers/badge.py#L68

Works, but that .join() bothers me.  I think it is because I feel like
I am using string/char functions on bytes. which are the same thing,
mostly.. but... I have issues.


-- 
Carl K