Converting pdf to image adds lines

Aspose.PDF Product Family
1

When i use aspose to convert a pdf to image, it adds white lines to the image.
See below.
after
image.jpg (38.6 KB)
before:
image.jpg (75.3 KB)
Here is the code used to convert
var imageDevice = new PngDevice();
documentBuilder.Font.Color = Color.Blue;
documentBuilder.Font.Size = 8;
using(var stream = new MemoryStream())
{
foreach(var page in pdfDoc.Pages)
{

                imageDevice.Process(page, stream);
            }
        }
2

@dmerkle1

Have you tried using the latest version of the API? Also, can you please share the sample PDF for our reference so that we can test the scenario in our environment and address it accordingly?