Preview lost signature, print also lost signature

[Weishixun]

Preview lost signature, print also lost signature，Is it because of missing fonts?Does anyone know? please help me，thank you very much，Here are a few renderings of the preview, as well as a log of the converted image！！！！

Here are a few renderings of the preview

This is the original document

his is the effect of converting the original into a picture

Here is the log of the transferred image

[pcorless]

I don't think it's a font issue. Any chance you can sign a sample file for investigation?

[Weishixun]

test.pdf
this pdf

[pcorless]

Thanks, I'll take a look and get back to you.

[pcorless]

I managed to get it to render but I do have quite a bit of regression testing to run. The fix was two part but unfortunately is due to some content that isn't strictly proper in PDF/post script grammar.

The content in question sort of looks like this.
BT
1 0 0 1 2 2 Tm
q 70.87 0 0 28.25 2 2.05 cm /img1 Do Q
70.87 0 Td
-70.87 0 Td
ET
By PDF rules there shouldn't be a 'Do' in a BT/ET block (begin text, end text block). The 'Do' does the image drawing. The content parser makes some assumptions for execution speed and skips over the /img1 loading. I'll create a ticket and hopefully get a full fix in in the coming days.

[Weishixun]

Thank you for your support, thank you very much 🙏

[Weishixun]

I use the old version of 6.2.2, like this,

can I just update my jdk to 11 or higher, if I want to use java 8, is there a solution

[pcorless]

Java 8 is a tricky as it technically is end of life for support and it difficult to keep supporting so many versions. I'd strongly recommend upgrading to at least 11 LTS or 17 LTS.