pdf source code：
src.zip (4.4 KB)
origin pdf 1:
0010 (1).pdf.zip (74.3 KB)
before converted 1:
before converted 1.png (520.9 KB)
after converted 1:
after converted 1.jpg (311.9 KB)
origin pdf 2:
桐泰.pdf.zip (112.5 KB)
before converted 2:
before converted 2.png (429.6 KB)
after converted 2:
after converted 2.png (117.1 KB)
There are some differences after converted，Please have a check.
We have tested the scenario using the latest version of Aspose.PDF for Java 22.2 and have not found the shared issue. So, please use Aspose.PDF for Java 22.2. We have attached the output PNG files with this post for your kind reference.
image1_out.png (52.8 KB)
image2_out.png (37.6 KB)
We have not faced the same issue at our end while using the latest version of Aspose.PDF for Java. We noticed that text characters are lost after PDF to PNG conversion. For the sake of correction, we have logged this problem in our issue tracking system as PDFJAVA-41438. You will be notified via this forum thread once this issue is resolved.
We apologize for your inconvenience.