Issue with Lightroom Book Module

[#1]

I have recently created a large Book in LR Book module. 76 Pages. All images were taken on a Canon 80D, with a resolution of 6000x 4000, so even with a little cropping they wil be at least 5000+ x 3000+.

The book is to be printed as 10" x 8" - so I have specified to produce as a PDF with settings as sRGB with resolution of 300dpi.

When I Export to PDF, then upload to the Printing Company, they give me a warning to say that the resolution is between 72 - 100 dpi. 

How can this be? Surely even at 4000 resolution in LR it would print on 10" as 400dpi?

Is there an issue with creating a PDF?

Thanks for advice

Phil

[#2]

I have recently created a large Book in LR Book module. 76 Pages. All images were taken on a Canon 80D, with a resolution of 6000x 4000, so even with a little cropping they wil be at least 5000+ x 3000+.

The book is to be printed as 10" x 8" - so I have specified to produce as a PDF with settings as sRGB with resolution of 300dpi.

When I Export to PDF, then upload to the Printing Company, they give me a warning to say that the resolution is between 72 - 100 dpi. 

How can this be? Surely even at 4000 resolution in LR it would print on 10" as 400dpi?

Is there an issue with creating a PDF?

Thanks for advice

Phil

[#3]

The settings need to be adjusted here before you output to pdf:

[#4]

Hi cmgap - My settings were almost the same - see below ...

Would that reduction in quality Really make that much difference?

[#5]

Most likely one or more of the 76 pages has an image file that isn't 300 dpi when placed into the book. If you have 'Zoom Photo To Fill Cell' checked the placed images are resized to fit the cell, which may lower the dpi.

I did a preflight check in Acrobat DC Pro with your Book settings and 'Zoom Photo To Fill Cell.' The dimernsions are 2888 x 2475 pixels, 9.625" x 8.250" with resolution  300.052 ppi horizontal and 300.000 ppi vertical. The 'Zoom Photo To Fill Cell' placed image dimension will resize the long edge 20% (or more) requiring 3465 pixels long edge for 300 dpi. Check your placed images long edge cropped dimension.

[#6]

Thanks Todd - I checked all of the images and they are all at 300dpit. The warnings I was getting was on Every image - not just the odd one. Guess I'll see the results when the book arrives next week.

[#7]

Can I suggest to always design a book with the [Book Settings] set to- Book: Blurb Photo Book. (Convert to PDF later)

Only in this setting will you see the resolution warning [!] on the photos. (It does not appear in PDF mode)

Click on the [!] for an explanation of the PPI.

[#8]

Thanks WobertC.

The warings I was getting were from the Printer (Mixam.co.uk) when I uploaded it - not from Lightroom.

I changed to Blurb Book to see if I got those same warnings - but none shown.

[#9]

If you can export to PDF your book with just 2 or 3 pages using your settings I'll check it in Acrobat Pro. It's possible your LR Preferences file is corrupt, which can cause some strange issues. Let me check the PDF first and if the resolution is incorrect the next step would be to reset your LR Preferences file.

[#10]

Thank you Todd, much appreciated.

How do I uplaod a pdf file to this forum? Can't see an option to do it?

[#11]

Upload the file to Dropbox or any other file sharing site and place the share link in a reply here. Thank you.

[#12]

Apologies Todd - Only just saw that you had replied. 

I have uploaded it to WeTransfer, it is quite big.

https://wetransfer.com/downloads/2bf5a6ab641d782cef541b5227a959fa20200717080452/ca7cb5a2fa013c19d5d0...