PDF Size/Quality Control

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   Hi,
I am using importemffromfile function to convert a metafile into pdf format, i am using bitmap image as vector image is not giving me properly formatted pdf. But issue with bitmap or vector image for me is that size of the pdf being generated is too much, for a 50kb emf file I am getting around 2.7mb of pdf with bitmap and 12mb of pdf with vector image for 6 pages. It seems like DPI of pdf is too high.

Is there a way that i can control dpi or quality of pdf while generating pdf, so that i can get pdf file with reasonable size. 

Thanks

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vk_rt Members Profile Find Members Posts Beginner Joined: 29 Jun 11 Status: Offline Points: 6	Post Options Post Reply Quote vk_rt Report Post Thanks(0) Quote Reply Topic: PDF Size/Quality Control Posted: 30 Jun 11 at 1:52AM
	Hi, I am using importemffromfile function to convert a metafile into pdf format, i am using bitmap image as vector image is not giving me properly formatted pdf. But issue with bitmap or vector image for me is that size of the pdf being generated is too much, for a 50kb emf file I am getting around 2.7mb of pdf with bitmap and 12mb of pdf with vector image for 6 pages. It seems like DPI of pdf is too high. Is there a way that i can control dpi or quality of pdf while generating pdf, so that i can get pdf file with reasonable size. Thanks

Rowan Members Profile Find Members Posts Moderator Group Joined: 10 Jan 09 Status: Offline Points: 398	Post Options Post Reply Quote Rowan Report Post Thanks(0) Quote Reply Posted: 30 Jun 11 at 1:17PM
	A PDF does not have any concept of DPI. It's like that the image data is compressed in the EMF and when it's added to the PDF is is uncompressed. Can you upload can example of the EMF and the resulting PDF that we can test?

vk_rt Members Profile Find Members Posts Beginner Joined: 29 Jun 11 Status: Offline Points: 6	Post Options Post Reply Quote vk_rt Report Post Thanks(0) Quote Reply Posted: 30 Jun 11 at 11:08PM
	So, does size of pdf only depends on size of emf? Is there any other quality/size/compression factor we can control? I added 3 examples here : http://www.raintreeinc.com/files/pdfandemf.rar PDF's are encrypted with password 1234. These pdf examples i generated are using older version pdf library but functions are same. With new version, i need to change and control size, if possible.

Rowan Members Profile Find Members Posts Moderator Group Joined: 10 Jan 09 Status: Offline Points: 398	Post Options Post Reply Quote Rowan Report Post Thanks(0) Quote Reply Posted: 01 Jul 11 at 10:51AM
	Image data and font data can have a big affect on the size of a PDF. For instance, in the PDFs you uploaded (specifically 'Productivity Report Page.pdf'), 99.87% of the file size is caused by image data. After adding the EMF to the PDF you can try calling CompressImages to see if you can compress the image data that way.

vk_rt Members Profile Find Members Posts Beginner Joined: 29 Jun 11 Status: Offline Points: 6	Post Options Post Reply Quote vk_rt Report Post Thanks(0) Quote Reply Posted: 01 Jul 11 at 9:13PM
	Check size of these 2 pdf files, one is generated from pdf library and another using pdf print driver. Big difference in file size with same data, 27kb and 1.4Mb http://www.raintreeinc.com/public/pdf_lib_testsize3page.pdf http://www.raintreeinc.com/public/pdfprint_driver_testsize.pdf I would like to get the file from library to around same size, I tried compressImages but didn't saw any change in file size lPDF.CheckError(lPDF.ImportEMFFromStream(lMetafileStream, 1, 1)); lPDF.CheckError(lPDF.compressimages(1));

vk_rt Members Profile Find Members Posts Beginner Joined: 29 Jun 11 Status: Offline Points: 6	Post Options Post Reply Quote vk_rt Report Post Thanks(0) Quote Reply Posted: 01 Jul 11 at 9:13PM
	again password is 1234 for the pdf

vk_rt Members Profile Find Members Posts Beginner Joined: 29 Jun 11 Status: Offline Points: 6	Post Options Post Reply Quote vk_rt Report Post Thanks(0) Quote Reply Posted: 05 Jul 11 at 8:03PM
	Hi Rowan, any other ideas?

Ingo Members Profile Find Members Posts Moderator Group Joined: 29 Oct 05 Status: Offline Points: 3524	Post Options Post Reply Quote Ingo Report Post Thanks(0) Quote Reply Posted: 05 Jul 11 at 8:18PM
	Hi vk_rt! The large file contains images and the page size is 6597 x 5100 pixels. The small file contains only text and the page size is 612 x 792 pixels. So work on the image-properties BEFORE using it for pdf-creation. Cheers and welcome here, Ingo

vk_rt Members Profile Find Members Posts Beginner Joined: 29 Jun 11 Status: Offline Points: 6	Post Options Post Reply Quote vk_rt Report Post Thanks(0) Quote Reply Posted: 06 Jul 11 at 2:17AM
	How do i decrease image size, to create that small size pdf? As compress images didn't worked out, do i need to use vector image? I also tried using setimageresolution function, that too didn't helped at all.

engstmalta Members Profile Find Members Posts Beginner Joined: 24 Jan 11 Location: Malta Status: Offline Points: 2	Post Options Post Reply Quote engstmalta Report Post Thanks(0) Quote Reply Posted: 30 Sep 11 at 9:57AM
	All ImportEMF functions embedd the complete fonts. So far so good. But those fonts are embedded as uncompressed streams not only one of the compress methods manage to compress them! That blows any PDF size generated with EMF out of proportion. What about allowing to compress existing font streams? Or another nice function would be CompressObject(compressiontype). With such a function we could manually search uncompressed objects and compress them. Thanks!