Hi.. Currently I'm facing the problem of the pdf unable to convert correctly into an image..Some content is lost after the convert.. the spire pdf version that I'm using now is 5.7.14.18040..
This is what i expected after convert:https://imgur.com/a/dzzqnxV
This is the current result after convert:https://imgur.com/a/ndAkpfE
Here I also attached the sample pdf file for you to test.. Thanks..