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A New Technique for Quantitative Analysis of Hair Loss in Mice Using Grayscale Analysis
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A step-by-step method to quantify coloration with digital photography.

Carolyne Houle1, Audrey Turcotte2, James E Paterson3

  • 1Département de biologie, Université de Sherbrooke, 2500 boulevard de l'Université, Sherbrooke, Québec, J1K 2R1, Canada.

Methodsx
|March 29, 2024
PubMed
Summary

This study presents a standardized digital photography protocol for quantifying animal coloration, making it more accessible and consistent for researchers. The method uses ImageJ software to analyze color proportions in images, aiding studies on social signaling and defense.

Keywords:
Color binarizationColor measurementColor segmentationColorimetric valueImage analysisLinearizationQuantification of coloration using digital photographyReflectance

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Area of Science:

  • Ecology and Evolutionary Biology
  • Animal Behavior
  • Bioimaging

Background:

  • Coloration plays a crucial role in animal communication, social signaling, and antipredator defense strategies.
  • Existing methods for quantifying coloration using digital photography often lack standardization and detailed protocols, hindering comparative research.

Purpose of the Study:

  • To provide a comprehensive, step-by-step protocol for quantifying animal coloration from digital images.
  • To enhance the accessibility and consistency of digital coloration analysis for researchers, regardless of their photography expertise.

Main Methods:

  • Detailed guidelines on photographic techniques for coloration analysis, including do's and don'ts.
  • Utilizing ImageJ software to extract reflectance values, apply linearization equations, and standardize images.
  • Implementing image binarization to measure the proportion of specific colors within defined areas of interest.

Main Results:

  • A robust methodological protocol for digital coloration analysis was developed and applied to painted turtles (Chrysemys picta).
  • The protocol successfully quantifies the proportion of red and yellow coloration on the neck and head of turtles.
  • Demonstrated adaptability of the protocol for diverse species and coloration studies.

Conclusions:

  • The developed protocol significantly improves the accessibility and consistency of coloration measurements using digital photography.
  • This standardized approach facilitates more reliable and comparable data across different studies in animal coloration research.
  • Empowers researchers to conduct sophisticated coloration analyses with readily available tools and techniques.