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PPTX to PDF: Image Quality Is Worse

We’re using Aspose Slide for .NET (C#) DLL version 21.2

Very simple comparison between original PPTX file (above) and generated PDF (below)

image.png (39.8 KB)

We have already tried increasing value of PdfOptions.SufficientResolution but to no avail, even if I set it to as high as 9600, quality is still same as if it was set to 128

Thank you for contacting support.
To investigate this case on our side and assist you, please share and specify the following:

  • input presentation file
  • output PDF file
  • code example that reproduces the problem
  • OS version on which the code was run

You can zip the files and upload them here.

This was tested in Win10, with following minimal sample code

Presentation presentation = new Presentation(input_file_full_path);
PdfOptions options = new PdfOptions();
options.JpegQuality = 100;
options.SufficientResolution = 128;
presentation.Save(output_file, SaveFormat.Pdf, options);

Attached are input/output files, it seems that issue actually only happens (or maybe only significantly noticeable) if image is rotated, see sample files below

sample-pptx-and-pdf.zip (4.6 MB)

Thank you for the additional data.
I’ve reproduced the problem with the image quality in the generated PDF and added a ticket with ID SLIDESNET-43042 in our issue tracking system. We apologize for any inconvenience. Our development team will investigate this case. You will be notified when the issue is resolved.

great, thank you