I'm creating an ebook in InDesign CS5.5. I'm planning to export to PDF, for viewing on laptops and tablets (I designed the page to fit an iPad2, at 187 x 250mm, with the idea it would then work on other devices too). The extent is 128pp, and will be roughly half and half text and photographs - I'm including over 300 colour pix. I've been designing the picture pages in Lightroom 4's Print module, and at the moment they're still RAW files (2592 x 3872px; 16.7MB).
I need to export them as JPEGs so I can add them to my InDesign file. I'm not sure what size(s) to export them at. Should I differentiate between those that are going to be used full-page and those that will be quarter-page or less? Or can I rely on InDesign to resize them proportionally when I later export to PDF?
Does anyone have any advice as to the best sizes to use at this stage? Lightroom allows me to specify quality for the JPEG, and also a longest edge size in pixels; or a resolution in ppi.
I'd also be very grateful for any advice on what parameters to set when I ask InDesign to convert the file into a PDF. I'm planning to offer it for sale from my website, and am worried (1) the file size will be too big for downloading and (on the other hand) (2) the picture files will be so compressed that they'll pixellate if anyone zooms into them.
Hope someone can help!