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

["Tilman Hausherr (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PDFBOX-2092?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14020953#comment-14020953 ] 

Tilman Hausherr edited comment on PDFBOX-2092 at 6/8/14 12:07 PM:
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{quote}
To test this, I have changed SampledImageReader and PDDeviceRGB to produce a packed raster with DirectColorModel. PageDrawer.drawImage completely vanished from the profiler output then.
{quote}
Could you post the code that does this?

And would this packed raster method also work with an image that has more than 4 color components? (Don't know if the spec allows such images, but we have a PDF with a DeviceN colorspace with 6 elements, but no image)


was (Author: tilman):
{quote}
To test this, I have changed SampledImageReader and PDDeviceRGB to produce a packed raster with DirectColorModel. PageDrawer.drawImage completely vanished from the profiler output then.
{quote}
Could you post the code that does this?

> Very slow rendering of scanned document
> ---------------------------------------
>
>                 Key: PDFBOX-2092
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-2092
>             Project: PDFBox
>          Issue Type: Improvement
>          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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