| 摘要 |
A method for differentiating dynamic range of image is disclosed. The method comprises the following steps. First of all, pixel numbers with the same level value of Density units D<SUB>n-1 </SUB>and D<SUB>n </SUB>are compared. Next the minimum pixel numbers of each level value of Density units D<SUB>n-1 </SUB>and D<SUB>n </SUB>are counted. Then the minimum pixel numbers of each level value of Density units D<SUB>n-1 </SUB>and D<SUB>n </SUB>are summed. Next the ratio of total minimum pixel number and total pixel number R and a specification value R<SUB>s </SUB>are compared. Then whether R is smaller than R<SUB>s </SUB>or not is determined so as to recognize whether Density units D<SUB>n-1 </SUB>and D<SUB>n </SUB>could be differentiated or not.
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