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Logarithmic 3-Band Color Encoding: Robust Method for Display and Comparison of Compositional Maps in Electron Probe
1Surface and Microanalysis Science Division, National Institute of Standards and Technology, Gaithersburg, MD 20899
Summary
Electron probe X-ray microanalyzer (EPMA) maps are enhanced using a novel logarithmic, multiband color-encoding method. This technique improves feature visibility and enables direct quantitative comparisons across different elemental maps.
Area of Science:
- Geoscience and Materials Science
- Analytical Chemistry
- Microscopy
Background:
- Electron-excited X-ray maps from SEM/EPMA are crucial for compositional analysis.
- Traditional gray-scale and pseudocolor methods limit quantitative comparisons.
- Existing intensity-encoding techniques often hinder inter-map analysis.
Purpose of the Study:
- To develop an improved visualization method for X-ray intensity ratio (k-value) maps.
- To enable effective quantitative comparisons between different X-ray maps.
- To enhance the visibility and interpretability of compositional data.
Main Methods:
- Development of a logarithmic, multiband color-encoding scheme for k-value maps.
- Definition of three color bands (blue, green, red) with specific intensity ranges.
- Application of a logarithmic scale within each band based on intensity ratios.
Main Results:
- The new method effectively visualizes trace, minor, and major compositional elements.
- Logarithmic multiband color encoding allows for direct, standardized comparisons of maps.
- Identical color scales across all maps facilitate analysis of different elements or areas.
Conclusions:
- The developed logarithmic multiband color-encoding method significantly improves X-ray map analysis.
- This technique overcomes limitations of traditional methods for quantitative comparisons.
- It offers a standardized approach for visualizing and comparing elemental composition data.