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Posted to dev@pdfbox.apache.org by "Constantine Dokolas (Jira)" <ji...@apache.org> on 2020/03/03 08:17:00 UTC
[jira] [Commented] (PDFBOX-4205) LosslessFactory alters image
[ https://issues.apache.org/jira/browse/PDFBOX-4205?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17049992#comment-17049992 ]
Constantine Dokolas commented on PDFBOX-4205:
---------------------------------------------
Methinks the test from grayscale should be changed to compare the (XObject) image stream bytes to the (BufferedImage) raster bytes. I'm not certain about this. It depends on what we consider as "reference" data.
> LosslessFactory alters image
> ----------------------------
>
> Key: PDFBOX-4205
> URL: https://issues.apache.org/jira/browse/PDFBOX-4205
> Project: PDFBox
> Issue Type: Bug
> Affects Versions: 2.0.7, 2.0.8, 2.0.9
> Environment: Ubuntu 16.04
> Reporter: Harry Dent
> Priority: Minor
> Attachments: image-2020-02-24-17-59-08-300.png, lossy.png, picture_of_text.png
>
>
> The attached grayscale png becomes lighter when run through the following code snippet:
> {code:java}
> BufferedImage image = ImageIO.read(new File("picture_of_text.png"));
> PDImageXObject xObject = LosslessFactory.createFromImage(new PDDocument(), image);
> BufferedImage lossy = xObject.getImage();
> ImageIO.write(lossy, "png", new File("lossy.png"));
> {code}
> The difference is easiest to spot by looking at the "S" in "41st". The loss in quality occurs in {{createFromImage()}} (rather than {{getImage()}}), which can be shown by embedding the {{PDImageXObject}} into a {{PDDocument}} and then saving this document to a file.
>
>
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