My environment:
aspose-slides-20.06-jdk16 or aspose-slides-20.04-jdk16
java version “1.8.0_102”
Java™ SE Runtime Environment (build 1.8.0_102-b14)
Java HotSpot™ 64-Bit Server VM (build 25.102-b14, mixed mode)
After converting pptx to png or jpeg, the file looks like a black bar
File for testing: BigTiff.pptx.zip (56.5 KB)
Test project: asposepom.zip (71.9 KB)