```csharp title="C#"
using Kreuzberg;

var config = new ExtractionConfig { EnableQualityProcessing = true };
var result = await KreuzbergLib.ExtractFile("scanned_document.pdf", null, config);

var qualityScore = result.QualityScore ?? 0.0;

if (qualityScore < 0.5)
{
    Console.WriteLine($"Warning: Low quality extraction ({qualityScore:F2})");
    Console.WriteLine("Consider re-scanning with higher DPI or adjusting OCR settings");
}
else
{
    Console.WriteLine($"Quality score: {qualityScore:F2}");
}
```