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Posted to dev@pdfbox.apache.org by "Tilman Hausherr (JIRA)" <ji...@apache.org> on 2017/12/20 14:31:00 UTC
[jira] [Comment Edited] (PDFBOX-4037) Appending an image to an
already existing PDF does not preserve image size
[ https://issues.apache.org/jira/browse/PDFBOX-4037?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16298587#comment-16298587 ]
Tilman Hausherr edited comment on PDFBOX-4037 at 12/20/17 2:30 PM:
-------------------------------------------------------------------
I created the attached PDF with ImageToPDF utility, the only difference is that it draws at x=20 y=20.
Showing it with Adobe Reader at 100% shows it inflated, there are "stairs". I suspect this is because my screen is at 125%.
Then I displayed it with IrfanView and with PDFBox (at 72dpi, regardless of the screen dpi) and then they have the same sizes.
The content stream has this:
{code}
q
36 0 0 35 20 20 cm
/Im1 Do
Q
{code}
36 and 35 are the sizes of the image, which are used for an affine transformation. So all is working as expected.
The "inflate" effect can also be observed with PDFDebugger 2.0.4 and older (that problem was fixed in PDFBOX-3665).
was (Author: tilman):
I created the attached PDF with ImageToPDF utility, the only difference is that it draws at x=20 y=20.
Showing it with Adobe Reader at 100% shows it inflated, there are "stairs". I suspect this is because my screen is at 125%.
Then I displayed it with IrfanView and with PDFBox (at 72dpi, regardless of the screen dpi) and then they have the same sizes.
The content stream has this:
{code}
q
36 0 0 35 20 20 cm
/Im1 Do
Q
{code}
36 and 35 are the sizes of the image, which are used for an affine transformation. So all is working as expected.
The "inflate" effect can also be observed with PDFDebugger 2.0.4 and older (that was fixed in PDFBOX-3665).
> Appending an image to an already existing PDF does not preserve image size
> --------------------------------------------------------------------------
>
> Key: PDFBOX-4037
> URL: https://issues.apache.org/jira/browse/PDFBOX-4037
> Project: PDFBox
> Issue Type: Bug
> Affects Versions: 2.0.8
> Reporter: Kevin Tabary
> Attachments: after_rendering.PNG, result.pdf, screenshot.png, signature.png
>
>
> Given an already existing document on which I want to append a small image at position (0;0) on the first page, when saving the PDF, the image appears somehow bigger than its original size.
> Please find below the code I am using:
> {code}
> public void mergePdfWithImages(MultipartFile pdf, MultipartFile image) throws Exception {
> PDDocument pdfDocument = PDDocument.load(pdf.getInputStream());
> PDPage pdfPage = pdfDocument.getPage(0);
> PDImageXObject pdfImage = PDImageXObject.createFromByteArray(pdfDocument, image.getBytes(), null);
> PDPageContentStream pageContentStream = new PDPageContentStream(pdfDocument, pdfPage, PDPageContentStream.AppendMode.APPEND, true, true);
> pageContentStream.drawImage(pdfImage, 0, 0);
> pageContentStream.close();
> pdfDocument.save("C:\\Data\\result.pdf");
> pdfDocument.close();
> }
> {code}
> I tried to set the flag compress / resetContext to any combination of true/false without any success. Please find the image (signature.png) I am using as well as the comparison after the PDF is rendered (afrer_rendering.png): the image appended on it is clearly bigger than its original size, is there any way to preserve original size ?
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