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Read-Only fonts substitution when exporting presentation slides into png images

We are trying to use Aspose.Slides .NET library to convert presentation’s slides to png images - one image per one slide. When presentation has embedded read-only font, library substitutes it with some another font, but size of text becoming bigger than originally and this causes overlapping issue. Is it possible to tweak substitution algorithm? We need that size of text with new font to be less than is currently produced.
The code is simple:
PresentationEx p = new PresentationEx(@“c:\Docs\PPT\abcd.pptx”);
for (int i = 0; i < p.Slides.Count; i++)
p.Slides[i].GetThumbnail(1.33333f, 1.33333f).Save(String.Format("{0}.png", i + 1), ImageFormat.Png);

Hello Dear,

Thanks for your interest in Aspose.Slides.

I have tried to understand the issue specified by you. I need to further reproduce the issue on our end and for that I request you to please share the source presentation file for further investigation. We really appreciate your cooperative response in advance.

Thanks and Regards,