How do I embed image in PDF using lossless PNG (Flate) compression?

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Nov 5, 2012, 3:49:44 PM11/5/12
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Q:
 
I would like to embed images to my PDFs without loosing any quality (i.e. using PNG instead of JPEG compression).
 
I was able to achieve lossless embedding with RAW/uncompressed format but the file size is huge.
 
I am trying to understand what is being done “under the hood” by PDFTron when adding images to the PDF that result in the pixilation effect.
 
How do I embed image in PDF using lossless PNG (Flate) compression?
 
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A:
 
To embed image in PDF with Flate you need to specify the compression hint as follows:

  

Obj flate_hint = objset.CreateArray();

flate_hint.PushBackName("Flate");

flate_hint.PushBackName("Level");

flate_hint.PushBackNumber(9); // Set max compression vs speed.

 

For more info, please see:

https://groups.google.com/d/topic/pdfnet-sdk/wCK-rAmEPr0/discussion

 

 
 
 
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