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From "Tilman Hausherr (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (PDFBOX-4391) Page to image rendering in pdfbox 2.0: Poor quality compared to 1.8
Date Mon, 03 Dec 2018 14:19:00 GMT

     [ https://issues.apache.org/jira/browse/PDFBOX-4391?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Tilman Hausherr updated PDFBOX-4391:
------------------------------------
    Labels: antialias image quality  (was: image quality rendering)

> Page to image rendering in pdfbox 2.0: Poor quality compared to 1.8
> -------------------------------------------------------------------
>
>                 Key: PDFBOX-4391
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-4391
>             Project: PDFBox
>          Issue Type: Bug
>          Components: Rendering
>    Affects Versions: 2.0.13
>         Environment: Windows 10
> JDK 1.8.0_181
>            Reporter: Olivier M
>            Priority: Major
>              Labels: antialias, image, quality
>             Fix For: 2.0.14
>
>         Attachments: barcode-128-BW-antialiasing-off.png, barcode-128.pdf, barcode-image-1.8.16.png,
barcode-image-2.0.13.png, comparison.png
>
>
> I have a process that needs to convert pages of pdf files to images to be able to detect
barcodes.
> Since I've upgrade to pdfbox 2.0 my barcodes are not correctly detected anymore.
> I noticed the cause was the result of the page to image rendering implemented in pdfbox
2.0.
> The quality of the image is really poor compared to pdfbox 1.8.
> See the attached image (comparison.png):
> On the left you have the image generated with pdfbox 2.0.13
> On the right you have the image generated with pdfbox 1.8.16
> We can clearly see the difference.
> Both images were generated using the same resolution (200 dpi here):
> For 2.0.13:
> {code:java}
> BufferedImage image = pdfRenderer.renderImageWithDPI(0, 200, ImageType.BINARY);{code}
> For 1.8.16:
> {code:java}
> PDPage page = (PDPage) pdfDocument.getDocumentCatalog().getAllPages().get(0);
> BufferedImage image = page.convertToImage(BufferedImage.TYPE_BYTE_BINARY, 200);{code}
> Buffered images were both written to files using:
> {code:java}
> ImageIO.write(image, "png", file);    {code}
> I've attached the pdf file (barcode-128.pdf) and the generated images (barcode-image-2.0.13.png
and barcode-image.1.8.16.png)
>  
>  
>  
>  



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