Converting PowerPoint Slide to Image in C# Changes Bullet Look

Aspose.Slides Product Family
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1

Hi, hope you are having a good day.

We are using Aspose.Slides in .net 3.1 running on a linux server and the version of Aspose.slides is 20.3.0. When converting the slide to an image using slide.GetThumbnail, bullets of the slide are changing from
image.png (297 Bytes)

to
image.png (17.2 KB)

On windows the font color changes, but the bullets do not.

2

@dmerkle1,
Thank you for contacting support.

Most often, this problem can arise due to the lack of fonts. Please ensure that the fonts used in the presentation are installed on the OS on which the conversion was performed.

Alternatively, you can load the fonts before the conversion as follows:

FontsLoader.LoadExternalFonts(new string[] { "path_to_your_fonts" });

Custom PowerPoint Font in C#|Aspose.Slides Documentation

If the issues persists, please share the following files and information:

  • sample presentation file
  • code example to reproduce the problem on our end
  • output image file
  • OS version on which the conversion was performed
  • fonts used in the presentation
3

You are saying the bullet changing from square to the weird squiggly is caused by a missing font?
It also happens when converting the PPT to pdf. And I guess I’m wondering why we wouldn’t have an issue when converting a word document with square bullets to a pdf?

Here is a sample having the issue. It only happens on a linux server.
Presentation1.zip (28.1 KB)

4

@dmerkle1,
Thank you for the additional information. I’ve reproduced the problem you described. We are sorry that you have to encounter this problem.

We have opened the following new ticket(s) in our internal issue tracking system and will deliver their fixes according to the terms mentioned in Free Support Policies.

Issue ID(s): SLIDESNET-44648

You can obtain Paid Support Services if you need support on a priority basis, along with the direct access to our Paid Support management team.

5

@dmerkle1,
Our developers have investigated the case. To ensure these characters display correctly, the Wingdings font must be installed on the system where the application is running.

6

Thanks for the reply. Is this just for the version of Aspose we have, or is that the case for the newer versions as well?

7

@dmerkle1,
This is a typical situation when a font used in a presentation is not available on the operating system where the conversion was performed. This can happen with any version of Aspose.Slides.

FAQs|Aspose.Slides Documentation

8

The issues you found earlier (filed as SLIDESNET-44648) have been fixed in Aspose.Slides for .NET 24.12 (ZIP, MSI, NuGet, Cross-platform).
You can check all fixes on the Release Notes page.
You can also find the latest version of our library on the Product Download page.