Preparing photos for PDF Web Documents

Hi,
I am a newcomer to InDesign but use Photoshop.
If I put together an InDesign (CS3) document for a company website,and this document is to be viewed online or be available for download, should I prepare the images at 300 dpi / ppi or 72? I am concerned about the image quality when people download the brochure and print them off. Should one be at 72 (or higher) for viewing online and another at 300 if for download?
I've tried to research this but only seem to find answers for sending photos via email (Save for Web etc) and can't dind anything specific to preparing InDesign documents for use on the web.
Appreciate your help.
Philby

Resolution doesn't exist on the web, only pixel dimensions, so the quality of the image doesn't change when you change the resolution.
In print, however, you are working with physical dimensions into which you must fit the pixels. Higher resolutions (i.e. more pixels fit into the space) tend to look better. Keep in mind that the "effective resolution," that is the scaled value at the print dimensions, is the only one that counts. Captured size and resolution are meaningful only in as much as they allow you to calculate the limits to which you can scale without serious degradation. Up-sampling in Photoshop almost never works.
The rule of thumb is that effective resolution should be twice the half-tone line screen of the output. Since 150 LPI is a very standard screen for offset litho on coated stock you get the de facto 300 PPI standard, but the truth is that required resolution is highly dependent on printing method and intended viewing distance, and two times line screen is just a guideline to insure enough data -- not a minimum -- and as little as 1.4 times will often give satisfactory results, particularly on a device which uses FM screening rather than a conventional halftone dot, like a desktop inkjet printer.
My rule of thumb for desktop devices is 200 ppi is nice, 180 ppi is adequate, and as low as 100 ppi will probably work, though it won't look like fine art.
I do a few jobs that have both web and printed versions. I used to do two PDFs for the web -- a screen-only version and a "printable" version -- but over time I've found that even the version intended for viewing only (downsampled to 75 ppi during export) prints on desktop devices at a quality the average user wouldn't distinguish from the printable version at 150 ppi downsampling.
Peter

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