How to Measure Leaf Disease Damage Using Image Analysis in ImageJ

An example of image processing techniques for image-based quantification of leaf disease damage using ImageJ.

This new 13-page article introduces simple image processing and analysis techniques to quantify leaf disease damage using ImageJ, an open-source image processing program. These techniques are not meant to replace crop scouting or disease diagnosis by a plant diagnostic laboratory, but rather to provide a supplemental tool for making quantitative measurements of leaf disease damage. Similar techniques are also available for plant growth assessment, including plant height, plant width, and canopy cover area. The image processing and analysis techniques introduced in this article are fairly simple to use and thus can be adopted not only by researchers, but also by producers, crop consultants, Extension agents, and students. Written by Lillian Pride, Gary Vallad, and Shinsuke Agehara, and published by the UF/IFAS Horticultural Sciences Department.
https://edis.ifas.ufl.edu/hs1382

Utilizing Basic Digital Photography Techniques on the Farm (WC110)

donkey in diagonal rows of hay roundsThis 3-page fact sheet focuses on plant and livestock photography and caption writing and outlines tips for taking digital photographs on the farm using a basic digital or cell phone camera. Written by Ricky Telg, Carly Barnes, and Adrienne Boyette, and published by the UF Department of Agricultural Education and Communication, August 2011.
http://edis.ifas.ufl.edu/wc110

WC096 Photo Editing

WC096, a 4-page fact sheet by Ricky Telg, explains how to take good photographs and make them look even better through photo editing. Includes references. Published by the UF Department of Agricultural Education and Communication, July 2010.
http://edis.ifas.ufl.edu/wc096

WC095 Digital Photography Composition Techniques

WC095, a 6-page illustrated fact sheet by Ricky Telg, presents techniques for organizing the subject through the viewfinder of a digital camera — how to hold the camera properly, angles, “rule of thirds” lines, depth of field, background distractions, and types of photos. Includes footnotes. Published by the UF Department of Agricultural Education and Communication, July 2010.
http://edis.ifas.ufl.edu/wc095

WC094 Digital Photography and Photographic Editing

WC094, a 4-page illustrated fact sheet by Ricky Telg, is first in a three-part series that offers tips on taking good digital photos and addresses the basics of digital photography. Includes references. Published by the UF Department of Agricultural Education and Communication, July 2010.
http://edis.ifas.ufl.edu/wc094