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iText getDpiX() returns zero and cannot maintain originality in .png  RSS feed

Krishna Chaitanya Reddy Balam
Posts: 22
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I am trying to print a .png file into pdf and I want the same clarity inside the pdf.
I was trying to
png.scalePercent(72f / jpg.getDpiX() * 100);
but getDpiX() returns zero.
Is there any way to keep the images as it is in pdf rather than default dpi.
The images are large in number and I cannot do something like

Please provide me a mechanism where I can preserve the originality of any .png image on pdf.
It is sorta covered in the JavaRanch Style Guide.
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