Lilly and Perkins/Bostock Libraries offer free onsite scanners. Any image in a book or periodical can be scanned in seconds for a reliable image for classroom or paper presentation. Scanned images should not be posted outside a classroom context (for example, not on the open internet) without copyright approval.
Image standards vary depending upon the intended use. Images for publication need to be much higher resolution than those for simple presentation. Before scanning, get familiar with the trade-offs in resolution and image size.
Scanning Stardards - Cal State-Northridge's page
Scanning Standards by type of material - University of North Texas Libraries page
TASI's Scanning Info page - Institute for Learning and Research Technology (ILRT), University of Bristol, UK
Besser, Howard. Introduction to Imaging. Rev. ed. Los Angeles: Getty Research Institute, 2003. Queens or LaGuardia: TA1637 .B477 2003 (available via CLICS)
Busch, David D. Mastering digital scanning with slides, film, and transparencies. Boston, MA : Muska & Lipman, c2004. Available to authorized users via ebrary.
Gookin, Dan. Digital Scanning and Photography. Redmond, Wash: Microsoft Press, 2000. Hostos or Staten Island: TR267 .G66 2000 (available via CLICS)
Cohen, Music, Architecture and Science/Engineering all have walk up scanners with book-saver edges for scanning an image to your personal flash drive.