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Rendering a SVG file with `feGaussianBlur` leads to a glitch in the resulting PDF file

Open BuZZ-dEE opened this issue 4 years ago • 4 comments

Describe the bug

Hi, I generated a PDF from a SVG file with a feGaussianBlur and the resulting PDF file has a glitch. Is this a bug in OpenPDF? If I render the same using Apache FOP v2.6 it has no glitch.

To Reproduce

Sample Code

Expected behavior

No glitch in the resulting PDF file.

Screenshots

SVG file with feGaussianBlur: svg_file_with_feGaussianBlur

PDF file rendered from SVG with feGaussianBlur using OpenPDF: pdf_file_rendered_from_svg_with_feGaussianBlur_using_OpenPDF

PDF file rendered from SVG with feGaussianBlur using ApacheFOP: pdf_file_rendered_from_svg_with_feGaussianBlur_using_ApacheFOP

System (please complete the following information):

  • OS: Arch Linux / EndeavourOS

SVG file and resulting PDF files: svg_feGaussianBlur_pdf_rendering_files.zip

BuZZ-dEE avatar Mar 05 '21 14:03 BuZZ-dEE

Pull requests are welcome!

asturio avatar Mar 20 '21 12:03 asturio

@BuZZ-dEE this issue happen when there are many pictures to merge. when you use ApacheFOP, the pdf only have one picture. so it does not have a glitch. But if page page size of OpenPDF is suitable, it will have one picture and do not have a glitch. And how to solve the issue when too many picture to merged, I have not idea. I think it is the problem for the tool to render it. pdf: image origin format: image each image is 128*128, and I think cm has no problem.

Wugengxian avatar May 13 '21 23:05 Wugengxian

@Wugengxian what is a suitable page size? We tested the PDF in Okular, Evince, Qpdf and Adobe Reader, all these tools show a glitch. Do you know a tool, which renders this correct?

each image is 128*128, and I think cm has no problem.

What do mean, "cm has no problem"?

BuZZ-dEE avatar May 27 '21 20:05 BuZZ-dEE

I tried to recreate the issue and think the problem is with pixel count/viewing pdfs in different viewers on different systems. Playing around with pagesize made the issue go away on a Linux pdf viewer but brought up a weird line to the right on the Windows adobe and Microsoft Edge viewer. It may have to do with pixel count in the pdf, this article helps explain it: https://docs.oracle.com/cd/E87306_01/TSG/FAQ/Fixing%20the%20thin%20line%20display%20issue%20when%20viewing%20a%20PDF.html Virtual_machine_rendered Windows_adobe

korlan01 avatar Dec 06 '21 00:12 korlan01