There is a freeware AppleScript-based application by the name of Sequimago which should fulfill your requirements admirably. It is available from this page at MacScripter, a forum site where Martin Michel, Sequimago's author, is an administrator.
This is his description of the program:
Requirements
Mac OS X 10.5 Leopard •
QuickTime 7.2.1
Installation & Usage:
Download and
extract the ZIP archive. Then open the
script with a double click or drop a
bunch of image files onto its icon.
The script will then ask you to
specify a file name and location for
the new QuickTime movie. After you
provided certain settings for your
image sequence (e.g. frames per
second/seconds per frame), your image
sequence will be produced.
Supported Image Formats:
jpg, jpeg,
gif, png, tiff, tif, psd, pict, bmp,
pdf (only the first page of a PDF
document is recognized)
Notes:
Sequimago currently uses the
JPEG image format for the image
sequence, which results in a smaller
file size of the QuickTime movie. But
you can easily edit the Python script
to use alternative image formats (e.g.
TIFF). The Python script is located
at: Sequimago.app/Contents/Resources/crtimgseq.py
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P.S. -- I think you'll appreciate a comment he made in the course of explaining how he came to write the program:
I knew that you could easily create
custom slide shows with QuickTime Pro,
but why spent hard-earned $29.99 when
you can get the same functionality
free of charge by using built-in Mac
OS X 10.5 technologies?