Re: Rendering an image at a lower resolution

[Tilman Hausherr]

Am 23.02.2018 um 08:31 schrieb Itai:

Hi,

I'm trying to use PDFBox to show a preview of some PDFs containing very
large images (typically tens of thousands of pixels a side).
It seems PDFRenderer uses PDImage#toImage, which creates a BufferedImage at
the full resolution, regardless of the DPI or scale requested by
PDFRenderer.
This causes an issue, as the resulting BufferedImage is often too large to
fit in memory (>8GB), causing an OOM error.

Is there a way to get a scaled BufferedImage at a lower quality, without
first having to render/produce a full-resolution BufferedImage?


No



If not - where would I start if I needed to add such a feature?


You could grab the source code and look at it... that isn't so easy. You 
could look at SampledImageReader and debug from there. The problem is 
that this class wouldn't know that a "smaller" image is needed.


Tilman

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Re: Rendering an image at a lower resolution

[Luca Loiodice]

I have the same issue, while trying to just render images in AWS lambda (where 
there is limited memory available).
So if there was a way to make this work, it would be great. 

On 2018/02/23 07:31:31, Itai  wrote: 
> Hi,> 
> 
> I'm trying to use PDFBox to show a preview of some PDFs containing very> 
> large images (typically tens of thousands of pixels a side).> 
> It seems PDFRenderer uses PDImage#toImage, which creates a BufferedImage at> 
> the full resolution, regardless of the DPI or scale requested by> 
> PDFRenderer.> 
> This causes an issue, as the resulting BufferedImage is often too large to> 
> fit in memory (>8GB), causing an OOM error.> 
> 
> Is there a way to get a scaled BufferedImage at a lower quality, without> 
> first having to render/produce a full-resolution BufferedImage?> 
> 
> If not - where would I start if I needed to add such a feature?> 
> 
> Thanks,> 
> Itai.> 
> 
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