letsfindaway
commented
6 months ago Indeed this message is new with 1.7, but the behavior was the same with 1.6.x.
When you first import a PDF file, annotate it and then export it again, then OpenBoard tries to use the original PDF document and inserts the annotations as graphical objects. For that, it has a built-in PDF merger, which analyzes the original PDF document and modifies it accordingly. This might however not work for some PDF documents using recent features. So there is a fallback solution. If the PDF merger is not able to completely understand the original PDF document, then instead a rendered image of the PDF page is used and the annotations are placed on top of that image.
Visually, there is no difference in the result (except that you would see the rendered pixels when zooming in), but structurally, there is.
- In a typical PDF document, text is embedded as characters and associated font. Similar graphical items like a line is embedded as a selectable object. In a PDF reader you can typically select and copy text. When the document is rendered, it is however a pure image and characters or graphical objects are no longer selectable.
- Describing characters and other graphical items as objects typically takes less space than representing them as image. So the resulting PDF document is in most cases larger (more heavy).
The message just wants you make aware of this. But I cannot tell you how to "repair" such a PDF document. Does somebody else have a suggestion for that?
FAN-ZY
Hi everyone,
When I'm exporting an anotated PDF to PDF, I'm getting a warning saying "The original PDF imported in OpenBoard seems not valid and could not be merged with your annotations. Please repair it and then reimport it in OpenBoard. The current export will be done with detailed (heavy) images of the pages of the original PDF instead, to avoid complete export failure."
I never got that warning while using version 1.6.x, but I'm quite new with 1.7.1 and would like to know that this warning is about.
Thanks in advance.