Method dbmToRgb

src/gui/SpectrumWidget.cpp:7648–7664

// ─── Colour map ───────────────────────────────────────────────────────────────

QRgb SpectrumWidget::dbmToRgb(float dbm) const
{
    // Black level shifts the floor: higher black_level = more of the noise is black.
    // Color gain controls the visible range: higher gain = narrower range = more contrast.
    // black_level 0-125: higher = floor moves closer to signals (more black)
    // color_gain 0-100: higher = narrower visible range = more contrast
    const float floorShift = (125 - m_wfBlackLevel) * 0.4f;  // inverted: 0=max shift, 125=no shift
    const float visRange = 80.0f - m_wfColorGain * 0.7f;  // 80 dB down to 10 dB
    const float effectiveMin = m_wfMinDbm + floorShift;
    const float effectiveMax = effectiveMin + visRange;

    const float t = qBound(0.0f, (dbm - effectiveMin) / (effectiveMax - effectiveMin), 1.0f);

    int n = 0;
    const auto* stops = wfSchemeStops(m_wfColorScheme, n);
    return interpolateGradient(t, stops, n);
}

QRgb SpectrumWidget::dssStrengthToRgb(float s) const
{