研鼎知识库 en:yanding:image_quality_evaluation:tools:test_charts
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18% Gray
I. What is 18% Gray?
18% gray refers to a neutral gray with a light reflectance of 18%, commonly used for exposure calibration (e.g., using a gray card) and color management (e.g., custom white balance, post-production color grading reference).text/html2026-07-10T08:03:08+00:00Anonymous (anonymous@undisclosed.example.com)en:yanding:image_quality_evaluation:tools:test_charts:chart_selection_guide
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How to Choose the Right Test Chart?
In image quality evaluation (e.g., for cameras, display devices, LiDAR, etc.), test charts are standardized and reproducible core tools—they translate $tan\frac{DFOV}{2}=\frac{D /2}{S}$$D=2S\frac{DFOV}{2}$$OD = \log_{10}\left( \frac{I_{0}}{I} \right)$$实际最小物理精度（微米）=\frac{25400}{DPI}$text/html2026-07-10T08:03:07+00:00Anonymous (anonymous@undisclosed.example.com)en:yanding:image_quality_evaluation:tools:test_charts:material_selection_guide
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Test Chart Material Selection Guide
Test charts are core tools in fields such as optical testing and imaging system evaluation. Their materials directly affect testing accuracy, service life, and applicable scenarios. Selecting the appropriate test chart material requires a comprehensive analysis of the pros and cons of various materials, taking into…text/html2026-07-10T08:03:08+00:00Anonymous (anonymous@undisclosed.example.com)en:yanding:image_quality_evaluation:tools:test_charts:usage_maintenance_storage_guide
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Guidelines for the Use, Maintenance, and Storage of Test Charts
Test charts are indispensable reference tools in image quality evaluation, and their integrity directly determines the accuracy of test results. Improper use and storage environments can cause charts to fade, scratch, or deform, thereby rendering them useless for calibration.