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 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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