Why can't I reduce size of PDF created from multiple JPEGs?

Hi,
Using Adobe Acrobat Professional 8.0, I combined a bunch of JPEGs and turned them into a PDF. Because the resulting PDF was very large, I tried various Adobe tools to create a smaller version. However, nothing worked.
Am I missing something? Or is it simply impossible to shrink the size of a PDF when it's created from JPEGs?
Many thanks for your help.

Unless you use size reduction on the images, you are not going to do much better than the JPegs themselves, that is unless the JPegs used no compression at all. There are limits to compression and you have probably reached it.
Using Reduce File Size, you can usually reduce the size, but you will generally be reducing the resolution as well. If that is desired, you might find reducing the size of the graphics in a dedicated graphics package might be a better choice, followed by creating the PDF.

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