[jira] [Commented] (PDFBOX-2092) Very slow rendering of scanned document

["Juraj Lonc (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PDFBOX-2092?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14007057#comment-14007057 ] 

Juraj Lonc commented on PDFBOX-2092:
------------------------------------

This is test code
{code}
PDDocument pdDoc=PDDocument.load(f);
int page=0;
List<PDPage> allPages=pdDoc.getDocumentCatalog().getAllPages();
PDPage pdPage=allPages.get(page);
		
PDFRenderer renderer=new PDFRenderer(pdDoc);
BufferedImage bufferedImage=renderer.renderImageWithDPI(page, 300, ImageType.RGB);
ImageIO.write(bufferedImage, "png", new File("output.png"));
{code}

> Very slow rendering of scanned document
> ---------------------------------------
>
>                 Key: PDFBOX-2092
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-2092
>             Project: PDFBox
>          Issue Type: Bug
>          Components: Rendering
>    Affects Versions: 2.0.0
>         Environment: Win7 x64 EN
> JDK6,JDK7,JDK8
>            Reporter: Juraj Lonc
>         Attachments: SCAN_20140522_160457490_page2.pdf
>
>
> It takes extremely long to render this file to image.
> Depends on computer but it can take 15s+ to render 1 page.
> When I skip drawing of inserted image /Im0, then rendering is fast. So there is something wrong with drawing that image in
> {code}
> PageDrawer.drawImage(Image awtImage, AffineTransform at)
> {code}
> when I comment out line 
> {code}
> graphics.drawImage(awtImage, imageTransform, null);
> {code}
> then rendering process takes 6s



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