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Image rendered with getThumbnail has negative colors

Please find enclosed a ppt file consisting in one image that does not render correctly with getThumbnail on my computer: I get a negative image.
Can you fix it and/or explain what in this image is special ?
Thank you.

Hello,

<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

It seems a bug and needs to be fixed.

Was there ever an isssue ID assigned to this bug? I am now experiencing the same problem, using aspose.slides version 2.2.0.

Hi John,

Thanks for considering Aspose.Slides.

I have been able to reproduce the issue of negative colors appearing in the generated slide thumbnail using Aspose.Slides for Java and it seems to be an inconsistency. An issue with ID 16946 has been created in our issue tracking system for further looking in to issue and its resolution. The thread has been associated with the issue. so that you may be automatically notified once the issue is resolved.

We are sorry for your inconvenience,