[
https://issues.apache.org/jira/browse/PDFBOX-4205?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Harry Dent updated PDFBOX-4205:
-------------------------------
Description:
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.
was:
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 most easy 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.
> 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: 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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