File size of PDF output is far too big!

Parvati · 11-20-2014, 08:54 AM

I have used Calibre to convert EPUB to PDF many times with good results.
This time I face a problem I have no clue what to do:

The 2.7MB EPUB is converted into a 100.3MB PDF!
The file consists of about 100 pages of mostly text, a few pictures which are all optimized for fast screen view, nothing which would explain this extreme big file size.

I hope someone knows this problem and can help me to fix it.

Thanx
Parvati

toomuchreading · 11-20-2014, 05:08 PM

I have had this problem in the past as well. It turned out that the individual pages in the epub file were really pictures, and not actual text, just pictures of the text, so the converter could not convert the file properly. All it could do was load the pages as pictures into the pdf file. Have you checked the epub file to see if the text is really text? You can do that with the edit epub function. If the pages are all pictures, short of doing an OCR on the individual pictures, I'm not sure what you could do. Maybe someone would have a better idea in this case, but let us know what you are dealing with inside the epub.

Parvati · 11-21-2014, 02:53 AM

I have formatted the ebook by hand in Sigil, so it is actually a very clean and proper code, consisting of real text. All necessary checks are done.

You are right: scanned pages will lead to a big file, definitely.
But it is not the problem I am facing here.

BetterRed · 11-21-2014, 04:05 AM

Quote:

Originally Posted by Parvati

I have formatted the ebook by hand in Sigil, so it is actually a very clean and proper code, consisting of real text. All necessary checks are done.

You are right: scanned pages will lead to a big file, definitely.
But it is not the problem I am facing here.

@Parvati - I'm not familiar with EPUB to PDF Conversions, the only thing in PDF Output settings that I thought might have the impact you're seeing is paper size - if it was very small then... Did you try a convert with default settings

I'd also try converting the PDF to 'html' and/or LaTex to see if I could pick up some clues from there.

BR

kovidgoyal · 11-21-2014, 04:07 AM

https://www.mobileread.com/forums/sho...d.php?t=186697

Parvati · 11-21-2014, 04:10 PM

In a similar thread I found the hint that the Mac OSX system is the reason for the huge files. I tried to convert my file on a PC and it worked out perfectly.

11-20-2014, 08:54 AM	#1
Parvati Junior Member Posts: 4 Karma: 10 Join Date: Mar 2010 Device: mobipocket	File size of PDF output is far too big! I have used Calibre to convert EPUB to PDF many times with good results. This time I face a problem I have no clue what to do: The 2.7MB EPUB is converted into a 100.3MB PDF! The file consists of about 100 pages of mostly text, a few pictures which are all optimized for fast screen view, nothing which would explain this extreme big file size. I hope someone knows this problem and can help me to fix it. Thanx Parvati

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11-20-2014, 05:08 PM	#2
toomuchreading Groupie Posts: 168 Karma: 1720 Join Date: Feb 2009 Location: Canada Device: PRS-T1	I have had this problem in the past as well. It turned out that the individual pages in the epub file were really pictures, and not actual text, just pictures of the text, so the converter could not convert the file properly. All it could do was load the pages as pictures into the pdf file. Have you checked the epub file to see if the text is really text? You can do that with the edit epub function. If the pages are all pictures, short of doing an OCR on the individual pictures, I'm not sure what you could do. Maybe someone would have a better idea in this case, but let us know what you are dealing with inside the epub.

11-21-2014, 02:53 AM	#3
Parvati Junior Member Posts: 4 Karma: 10 Join Date: Mar 2010 Device: mobipocket	I have formatted the ebook by hand in Sigil, so it is actually a very clean and proper code, consisting of real text. All necessary checks are done. You are right: scanned pages will lead to a big file, definitely. But it is not the problem I am facing here.

11-21-2014, 04:07 AM	#5
kovidgoyal creator of calibre Posts: 43,842 Karma: 22666666 Join Date: Oct 2006 Location: Mumbai, India Device: Various	https://www.mobileread.com/forums/sho...d.php?t=186697

11-21-2014, 04:10 PM	#6
Parvati Junior Member Posts: 4 Karma: 10 Join Date: Mar 2010 Device: mobipocket	In a similar thread I found the hint that the Mac OSX system is the reason for the huge files. I tried to convert my file on a PC and it worked out perfectly.

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