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| how does pdfsharp compress images? https://forum.pdfsharp.net/viewtopic.php?f=2&t=1724 |
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| Author: | emilioesteve [ Tue Jul 26, 2011 11:07 am ] |
| Post subject: | how does pdfsharp compress images? |
Hi, Could anyone tell me what compression is chosen when it creates the pdf? Is there a way to push a compression type or is it done automatically? I'm creating pdfs with only images, and these images are black & white. How can I know the compression used in the pdf file? I have read in the forum that PdfSharp uses LZ, but if I open the pdf file with a text editor I can see after "/Filter" the Flate algorithm. Regards |
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| Author: | Thomas Hoevel [ Tue Jul 26, 2011 1:58 pm ] |
| Post subject: | Re: how does pdfsharp compress images? |
Hi! JPEG images are stored as they are. Bilevel images (monochrome) will be compressed using FAX encoding (CCITT) and/or LZW encoding. Other images use LZW encoding (called FlateDecode in PDF). PDFsharp does not analyse your pictures. If you store bilevel images in a 24 bit format, LZW encoding will be used. If you convert them to a 1 bit format, CCITT encoding will be used if that creates the smallest possible file (but LZW is better for certain bilevel files). |
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| Author: | emilioesteve [ Tue Jul 26, 2011 2:32 pm ] |
| Post subject: | Re: how does pdfsharp compress images? |
Thanks Thomas! That's exactly what I need to know. |
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