Apple Macintosh PhotoFlash - Manual (Page 131)

PhotoFlash allows you to change the default settings it uses for various
aspects of its operation, including virtual memory settings, thumbnail
size, and other preferences. This appendix explains how to change
PhotoFlash preferences and how different preference settings affect the
way PhotoFlash works.
In most cases the default settings work well for optimum performance. You
need to change them only if you have special needs.
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Appendix A
Setting PhotoFlash Preferences