# LOW_CONTRAST

> LOW_CONTRAST is a lint warning: a concrete authored paint remains in the output but misses a measurable contrast threshold against the final resolved page background.

- **Tier:** lint
- **Severity:** warning

## What triggers it

An authored color such as `themeVariables.radar.axisColor` resolves to less than 4.5:1 against an opaque page. Transparent output is not measured because its host backdrop is unknown.

## How to fix it

Choose a foreground or page color that meets the warning’s `minimum` ratio. The renderer preserves explicit authored paint, so re-run verify after changing the source rather than expecting an automatic repaint.

## Example

```mermaid
---
config:
  themeVariables:
    radar:
      axisColor: "#dddddd"
---
radar-beta
  axis speed, cost, safety
  curve current{4,3,5}
  max 5
```

Run `am verify diagram.mmd --json`, inspect this code, and apply the smallest source or typed mutation that clears it. If it persists after two mechanical attempts, return the warning and ask for human review.

Full page: https://agentic-mermaid.dev/warnings/LOW_CONTRAST/