mcluckie wrote in post #18337879 If it's going in a book from an offset press, the designer/printer doesn't want JPGs. Print file formats are TIFF and even PSD if i an Adobe workflow (InDesign). CMYK, not RGB as in a JPG. As far as res goes, it's maybe a 150 line screen on a 2400 dpi output device. At 100% of use, you need 300dpi. You could figure a half page or whatever and do the res from there.
AZGeorge wrote in post #18339473
Only a few years ago this would have been true. Today a JPG at highest quality/minimum compression saved at full size is widely accepted. Prepress departments have learned to deal with the variables.
That said, if you can learn the publisher's requirements you can maintain maximum control over your work by following them.
+1.
Furthermore the OP said, "I'm just a mom doing it as a hobby..... I shoot raw only and process them in Lightroom 5 and save them as JPEG on my computer." There is no reason to suppose that she has other software on her home computer, not Photoshop and certainly not InDesign. Lightroom does not convert to CYMK. It exports only RGB. For an amateur enthusiast photographer the only sensible advice would be:
Export from the edited Raw files to high quality jpgs (80 - 100, since this is a one-time save 80 will give just as good quality as 100 and a much smaller file - easier to email a bunch of them). Do not resize, send all the pixels your camera supplies, less any that are lost to cropping. Unless you are specifically requested to send them in Adobe RGB color space, send them in sRGB. In the Ppi box in LR's Export page you can write in 300 - it really doesn't make any difference, but some people think it should be 300 so writing that will avoid unnecessary complaints.
