Interactive Java Tutorials
Exposure Characteristic Curves
This interactive Java tutorial explores the relationship between the slope (often referred to as gamma) of characteristic curves exhibited by transparency and negative films and the amount of contrast produced by these films. Instructions for operation of the tutorial appear below the applet window.
The tutorial initializes with a characteristic curve of a typical black & white film on the left side of the window and the image produced by that film on the window's right side. Use the slider to adjust the slope of the characteristic curve, which simultaneously produces a change in image contrast. As the slope is increased, so is image contrast. The Choose A Specimen pull-down menu allows a visitor to select between several images, and the Color Images radio button changes the image palette from black & white to color photomicrographs of the same specimen.
Characteristic curves exhibited by transparency films slope in the opposite direction from those obtained with negative films . This occurs because a short exposure (underexposure) produces very dense transparencies but thin negatives, and a long exposure (overexposure) yields thin transparencies but dense negatives. In addition, characteristic curves for transparency films have a much steeper slope than negative films, due to the fact that transparency films have more inherent contrast and a very narrow exposure latitude.
Mortimer Abramowitz - Olympus America, Inc., Two Corporate Center Drive., Melville, New York, 11747.
Matthew J. Parry-Hill and Michael W. Davidson - National High Magnetic Field Laboratory, 1800 East Paul Dirac Dr., The Florida State University, Tallahassee, Florida, 32310.
BACK TO PHOTOMICROGRAPHY
Questions or comments? Send us an email.
© 1998-2015 by
Michael W. Davidson and The Florida State University.
All Rights Reserved. No images, graphics, scripts, or applets may be reproduced or used in any manner without permission from the copyright holders. Use of this website means you agree to all of the Legal Terms and Conditions set forth by the owners.
Last modification: Friday, Nov 13, 2015 at 02:19 PM
Access Count Since June 12, 2000: 19859
For more information on microscope manufacturers,
use the buttons below to navigate to their websites: