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Image Quality reduces when we merge multiple presentation files


We have an issue with the quality of image output while merging the multiple power point files.
We have replicated the issue in a sample project and attached the sample project here.
AsposeSlides-SampleProject-MergeFiles-Issue.zip (98.4 KB).

Also, Please find the respective attached PPTX files used for merging here
Files To Merge.zip (127.8 KB)

You need to put all the above files in a folder and map it’s path in the sample project.
MergeIssueForm.cs => Line Number => 18. (variable name appDir)

After that if you run the project and click on the “Merge PPT Files” button. You will get the merged file in the same folder (appDir). Now if you open and look at the output , the image quality is very low. (You can check the “Asset Growth” header text in 2nd Slide).

So this is the issue we are getting, only when we are merging all the four files that we have provided to you. But if you just exclude the first file named “1-SectionReport.pptx” when you are merging the file, then we don’t see this issue.. This looks very weird to us and not sure why it is happening.

Also, we have attached a screenshot of both the ppt output’s and you can review the quality difference here.
Merged all four files-Issue-Seen.png (105.1 KB)
Excluded 1st file for merging-No Issue.png (116.7 KB)

Please review and provide us a solution as soon as you can.

Thanks in Advance,

Thank you for the issue description. I reproduced the problem with reducing the image quality and logged the issue with ID SLIDESNET-42802 in our tracking system. Our development team will investigate this case. You will be notified when the problem is fixed.