Am 28.08.2015 um 07:57 schrieb Jon Wu:
Thanks for the guidance on not creating a PageDrawer. It was already
in our codebase like that and I was adapting without checking examples
until now. Since it was wrong, nevermind what I had before except to
say that I was generating a transparent BufferedImage with it in 1.x
and 2.0.0 from Feb.
Are both of these correct way to use PDFBox? With either of these on
the latest SNAPSHOT, I'm getting a black background.
1. new PDFRenderer(document).renderPageToGraphics(0, graphics);
2. new PDFRenderer(document).renderImageWithDPI(0, resolution,
ImageType.ARGB);
With #1, I was able to make it work by writing a transparent
background before renderPageToGraphics, but that is ugly of course.
There's nothing special about the PDF and it works fine with the
latest pdfbox-app.jar.
Every PDF is unique... upload your PDF somewhere, binary attachments
don't work on the mailing list.
Tilman
Tilman, yes setting a black transparent background doesn't really make
sense as a workaround, but given that I'm basically writing a couple
lines and I'm using ARGB, I don't know what else could be wrong.
For reference, I attached the PNG I get with my general code on 1.x
and 2.0.0 from Feb (expected), and the black image converted to PNG
that I'm getting with 2.0.0 latest. The PDF to generate these is
attached too.
On Wed, Aug 26, 2015 at 11:45 PM, Tilman Hausherr
<[email protected] <mailto:[email protected]>> wrote:
Am 27.08.2015 um 02:56 schrieb Jon Wu:
I'm getting a solid black background trying to convert a PDF
to an ARGB
BufferedImage after updating from 2.0.0-20150209.214830-1071
<tel:214830-1071> to
2.0.0-20150826.181706-1650. Is there any recent change that
could be
causing that?
--- Working OK on 20150209 ---
On 20150209, I had this and it worked fine - producing a
transparent image
once I converted to PNG using code like this:
BufferedImage result = new BufferedImage(width, height,
BufferedImage.TYPE_INT_ARGB);
Graphics2D graphics = result.createGraphics();
new PageDrawer(new PDFRenderer(document),
page).drawPage(graphics,
mediaBox);
That isn't the way you're supposed to use PDFBox.
--- Updating to latest broke things ---
When updating to the current snapshot, I simply changed the
last line to
use the new API:
new PDFRenderer(document).renderPageToGraphics(0, graphics);
Unfortunately, with this change + the newer version, I get a black
background on my BufferedImage instead of a transparent one.
I get the same issue when I do the following:
new PDFRenderer(document).renderImageWithDPI(0, resolution,
ImageType.ARGB);
I'd normally think there's something wrong with my code, but
this is the
only change I've made. Is there something wrong with the
rendering in the
latest PDFBox?
The best would be that you upload your PDF somewhere so we can
have a look at it.
The current code starts with a default bufferedimage of the type
you pass. Non ARGB images are assigned a white background, the
other images are kept as is.
--- Workaround ---
With renderPageToGraphics, if I call
graphics.setBackground(new Color(0, 0,
0, 0)); before rendering the page, I avoid this issue.
However, it seems
like this shouldn't be necessary.
So you're setting a black transparent background.
-- Cropping when rendering? ---
As a side note, I sort of miss being able to conveniently crop
the PDF
before rendering with a rectangle, but maybe I should just be
doing that in
Graphics2D land.
Tilman
Thanks,
Jon
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