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317 Views 3 Replies Last post: Jun 19, 2017 9:12 AM by walton RSS
Level 0 5 posts since
Sep 18, 2015
Currently Being Moderated

Jun 17, 2017 1:14 PM

2017 Reducing PDF size for print upload

Just switched to full bleed formats for 8 x 10 book prints. PDFs are now too large 598kb and reducing number of photos/ pages - has been the method for  reducing to meet CS limits.

Now however below 24 pages. The FREE online pdf compressors seem to set a limit of 100kb.

Any thoughts on a solution for a couple of book or low, low cost software approach (images are RBG jpgs)?

 

Does full bleed bloat image size?

Would book size bring an 8x 10 down as a 6x9?

 

Thanks

Level 5 18,690 posts since
Sep 5, 2009
Currently Being Moderated
1. Jun 17, 2017 6:03 PM in response to: SueBook
Re: 2017 Reducing PDF size for print upload

There are quite a few ways to reduce the size of a file.  Last year I did a 346 page, 8.5 x 11, full color, image book with approximately 340 7.625 x 10.5

 

How are you making your PDFs?  For example, Photoshop makes big files:

 

For a 5 x 8 RGB image at 300 dpi, converted to PDF in Photoshop using Save as PDF (PS PDF) and using Adobe Distiller (Distiller: Print > Adobe PDF)

 

Preset

PS PDF

Distiller

Press Quality

16.3MB

3.4MB

High Quality

12.9MB

1.6MB

PDF/X-1a

8.8MB

3.7MB

PDF/X3

4.9MB

1.9MB

 

 

Image color space (RGB vs CMYK) makes a big difference . . . CMYK can be twice as big!  In the table above, PDF/X-1a and Press Quality converted RGB to CMYK!

 

Here is how a 5 x 8, 300dpi, color JPG gets sized:

 

FormatCompressionColorSize
TIFF---CMYK14.6 MB
PSD---CMYK13.6 MB
TIFF---RGB10.6 MB
PSD---RGB10.6 MB
XCF---RGB10.6 MB
PSP---RGB7.9 MB
JPG100% / #12CMYK6.5 MB
JPG92% / #11CMYK4.3 MB
JPG100$ / #12RGB3.2 MB
JPG83% / #10CMYK3.1 MB
JPG92% / #11RGB1.8 MB
JPG83% / #10RGB1.3 MB

Notes:

PSD (Photoshop)., XCF (GIMP), PSP (PaintShop Pro)

#10, #11, #12 are Adobe compression levels, all are considered Maximum Quality; however, I wouldn't go to #10 or 83% unless all else fails

 

Without knowing what program your using to convert to PDF, image format and resolution, etc. it is difficult to give you specific advice.

 

Walton

 

Bleeds,  free, 91 page guide to bleeds, margins, covers, and annotated CreateSpace guidelines. Prepress Glossary: free, 79 page, fully illustrated prepress glossary with annotations for  CreateSpace users Type & Typography: free, 112 page illustrated guide to designing books, typography, with glossary, and type specimen pages  Free: list of free PDF downloads; selfpublishingforum: spam free forum. Contact  for graphics, design, and typesetting help.

 

Level 5 18,690 posts since
Sep 5, 2009
Currently Being Moderated
3. Jun 19, 2017 9:12 AM in response to: SueBook
Re: 2017 Reducing PDF size for print upload

24 pages . . . if your file were 400MB, each page would be 16.67 MB . . .

 

If I take a jpg and enlarge it until the close file size is about 16MB (15.8MB) the actual image size is 24.5 X 22.5 at 300 dpi.  JPG size varies according to image complexity, but this should be failry typical of something:

 

 

Check your PMs n a minute.

 

Walton

 

Bleeds,  free, 91 page guide to bleeds, margins, covers, and annotated CreateSpace guidelines. Prepress Glossary: free, 79 page, fully illustrated prepress glossary with annotations for  CreateSpace users Type & Typography: free, 112 page illustrated guide to designing books, typography, with glossary, and type specimen pages  Free: list of free PDF downloads; selfpublishingforum: spam free forum. Contact  for graphics, design, and typesetting help.

 

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