[reportlab-users] reportlab-users Digest, Vol 102, Issue 11

[Tim Meneely]

Perhaps I'm completely off-base, but there seems to be a mis-match between
your subject line and the text of your email. I don't know how to help with
saving drawings with transparent backgrounds (except using a standalone
program such as GIMP).

However, If what you're actually trying to do is "overlaying existing
bitmap images," that's pretty easy in ReportLab. I think I read
http://www.tylerlesmann.com/2009/jan/28/writing-pdfs-python-adding-images/
before
I did this, but ultimately I have something like:
    c = canvas.Canvas(buffer, pagesize=LETTER)
    filename = '/home/me/myimage.jpg'
    c.drawImage(filename, 0.5*inch, 0.5*inch,PAGE_WIDTH -
1.0*inch,PAGE_HEIGHT - 1.0*inch) # Who needs consistency?
    for bed in beds:
        c.drawString(bed.floorplan_x*inch, bed.floorplan_y*inch,
bed.occupant)

Sorry if this isn't what you meant.

Tim Meneely





> Date: Sun, 26 Aug 2012 18:56:09 +0200

> From: Dinu Gherman <gherman at darwin.in-berlin.de>

> Subject: Re: [reportlab-users] How to save drawings with transparent

>         background as PNG?

> To: reportlab-users <reportlab-users at lists2.reportlab.com>

> Message-ID: <A65F8253-F3B6-41CD-B0E9-CD5CC4CC8749 at darwin.in-berlin.de>

> Content-Type: text/plain; charset=us-ascii

>

> Hi,

>

> a few months back I asked the question below, which, sadly, hasn't attrac-

> ted any feedback, yet. I'm still interested to know if there is a way to

> do this inside reportlab or if I absolutely have to use pure PIL for over-

> laying existing bitmap images (not exactly what the code below does).

>

> Regards,

>

> Dinu

>

>

> On March, 11th, 2012 I wrote:

>

> > Hi,

> >

> > it seems like I am trying to do an impossible thing: generate a drawing

> > and save it as PNG with transparent background, see code below. Reading

> > the source code for renderPM provided little insight, so I wonder if it

> > can be done and how? (I'm using RL 2.5, BTW.)

> >

> > Thanks,

> >

> > Dinu

> >

> > PS:

> >

> > from reportlab.lib import colors

> > from reportlab.graphics.shapes import Drawing, String

> > from reportlab.graphics import renderPM

> >

> > d = Drawing(100, 100)

> > s = String(50, 50, "foo bar",

> >        fontName="Helvetica", fontSize=18,

> >        textAnchor="middle",

> >        fillColor=colors.black)

> > d.add(s)

> >

> > renderPM.drawToFile(d, "test.png", fmt="PNG", bg=None)

> > p = renderPM.drawToPIL(d, bg=0xffffff, configPIL={'transparent':

> 0xffffff})

> > p.save("test-pil.png")

>

>

>

> ------------------------------

>

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>

> End of reportlab-users Digest, Vol 102, Issue 11

> ************************************************

>

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