question: What are the five regions of the Hurter-Driffield curve ?
answer: the base + fog , the toe , the linear region , the shoulder , and the overexposed region
turker_answer: The five regions of the Hurter-Driffield curve are the base + fog , the toe , the linear region , the shoulder , and the overexposed region .
rule-based: The five regions of the Hurter-Driffield curve are the base + fog , the toe , the linear region , the shoulder , and the overexposed region .