Hello, dear GemBox support team,
We use GemBox.Pdf’s PDF → Image conversion functionality to generate thumbnails.
After a fairly recent update, we noticed a degradation in image quality for text-heavy documents (it appears that original fonts and/or their weights are no longer preserved), as well as a significant increase in the resulting image file size (two times or more).
In production, we typically extract relatively small thumbnails (up to 320×320 px). However, for demonstration purposes, I generated larger images to make the issue more visible.
The GemBox versions used are:
- “Old” version: 2025.10.106
- “New” version: 2026.1.107
Result from the “old” version:
Result from the “new” version:
For reference, here is how the original PDF document looks (I can share the PDF file itself if needed):
The difference in image file size is also quite noticeable: approximately 55 KB in the old version versus 130 KB in the new one.
Could you please advise what might have caused this change (both in visual appearance and file size), and what options are available to restore the previous behavior?
Thank you in advance.