/**
 * Converts a user-facing flow value into the alpha used for each brush stamp.
 *
 * Dense spacing draws many stamps over the same pixels. Without normalization,
 * even a low flow value quickly accumulates to solid color. This keeps the
 * visible stroke closer to the requested flow across different spacing values.
 */
export declare const normalizeFlowForSpacing: (flow: number, brushSize: number, spacing: number, minSpacing?: number) => number;
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