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HMI Color Code & Contrast Converter

Convert colors and check WCAG contrast ratios for high visibility.

Color Parameters

Normal Text (14pt) Large Text (18pt+)

Contrast Results

Contrast Ratio 16.0:1
WCAG AA (Normal) PASS
WCAG AAA (Normal) PASS
WCAG AA (Large) PASS
WCAG AAA (Large) PASS

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Disclaimer of Liability: This calculator is provided for educational and estimation purposes only. By using this tool, you agree to discharge AutomationView of any liability for direct, indirect, or consequential damages resulting from its use. It is your strict responsibility to independently verify all calculations, validate the results against official manufacturer documentation, and ensure compliance with all applicable safety and engineering standards before implementing any parameters in a production environment.

The Importance of ISA-101 in HMI Design

In industrial automation, HMI design must prioritize operator situational awareness and safety over aesthetic appeal. Standards like ISA-101 govern the layout and color philosophies, aiming to reduce cognitive load and prevent operational errors.

Standard HMI Color Conventions

Colors should be used sparingly. The goal is to keep “normal” operational states visually neutral so that abnormal conditions, like alarms, stand out instantly.

  • Background: Use neutral grays (e.g., #333333) instead of pure black to prevent eye strain and glare.
  • Running/ON: Standardized to Green in most non-process industries, indicating active states.
  • Stopped/OFF: Standardized to Red or dark gray depending on the specific plant style guide.
  • Alarms: Reserve bright, saturated colors like intense Red or Yellow exclusively for alarms and critical trips.

Optimizing Contrast for Accessibility

Excessive contrast can cause fatigue, while poor contrast obscures critical data. Implement a minimum luminance contrast ratio of 4.5:1 for text against backgrounds, aligning with WCAG guidelines. Moreover, never rely on color alone; always incorporate shapes and text to accommodate color blindness among operators.