← ToolBox / 动态范围档位

📷 Dynamic Range Stops Calculator

Estimate the dynamic range in stops from highlight and shadow limits, and check whether the scene fits the sensor's latitude.

最亮

最暗

传感器档

动态范围：DR = log₂(最亮 ÷ 最暗)（档，以 2 为底对数）；联动判定：DR > 传感器动态范围档数 → 溢出现场「是」，否则「否」。校验：最亮、最暗、传感器档三项非空合法数值守卫。判据：明暗比每翻倍 DR 增加 1 档，超出传感器容量即判定溢出。

单位为曝光档（stops）。

📚 深度解析：动态范围与溢出台阶

明暗比评估

场景亮度比 1000:1 ≈ log2(1000) ≈ 10 档；若传感器动态范围 14 档可容纳，高光阴影均不溢出；仅 8 档则需滤镜或包围。

溢出判定

动态范围 12 档、场景反差 14 档：超 2 档，最亮或最暗处必溢出，需压光比或 HDR。

Item	Formula / Rule	Source / Standard
Dynamic range	DR = 20 × log₁₀(full-well electrons ÷ read noise) in decibels	EMVA 1288 Standard for Characterization of Image Sensors
Stop conversion	Stops = DR in dB ÷ 6.02, since one EV equals about 6.02 dB	ISO 15739:2017 Photography — Noise measurements
Measurement basis	Vendors quote JPEG-acceptable range, while measured RAW often delivers one to two stops more	ISO 15739:2017 Photography — Noise measurements