Author Topic: Question about compression  (Read 389 times)

Farland

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Question about compression
« on: March 08, 2018, 07:04:18 pm »
Alright, so when I go to Export>Save as PDF and compression set to none, the PDF file is 2.3 gigs. But when I set compression to automatic and quality to maximum, it comes out to 300 megs.    All images in the document are 300 dpi and I set the maximum dpi to 300 so those hopefully didn't change.

So my question is, how can compression make such a huge difference in file size? Surely this will affect how the images look in print, or will it? Will there be a difference to the naked eye on the printed page? I would leave the compression at none, but the file size limit for the print-on-demand is 800 megs so I guess I have to do some compression during pdf export.

utnik

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Re: Question about compression
« Reply #1 on: March 08, 2018, 08:30:48 pm »
hi farland

your images are .tif files. with automatic compression scribus will export the .pdf with .jpg images.
with the quality set to 'maximum' this should usually be ok.

utnik

Farland

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Re: Question about compression
« Reply #2 on: March 08, 2018, 08:54:59 pm »
 Thanks again, Utnik.  I am making this for DriveThruRPG for print on demand at Lightning Source.  The whole thing is slightly confusing to me because the LS documentation suggests to use tiff images, which I did, but then DTRPG only allows a max file size of 800 megs for contents of a print on demand book.  Unless I am wrong, that basically rules out the use of tiff images.  Hmmm.

utnik

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Re: Question about compression
« Reply #3 on: March 09, 2018, 01:45:44 am »
…DTRPG only allows a max file size of 800 megs for contents of a print on demand book.  Unless I am wrong, that basically rules out the use of tiff images.

yes, in the case of almost 200 full page high resolution images it does – but you'll be fine with .jpg.

utnik

 

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