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大灰度測試卡

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  • 15級光學密度對應的灰階條紋
  • 灰階值對數分佈

這款多光學密度測試卡以白色相紙為基材，尺寸8.5英吋 x 11英吋，是測試光學系統灰階性能的理想工具。測試卡包含15級灰階條紋，光學密度範圍從0.09到1.5，分別按從高到低和從低到高的兩種順序排列。每級光學密度的光學密度增量為0.10。光學密度呈階梯線性變化，從而實現散射率的對數分布。由於對數分布相比線性分布測試卡，能根據實際需求提供精細與粗略增量階梯，因此在系統測試中更具優勢。測試卡厚度為0.2mm。測試卡採用相紙基材，光澤計測量值為32。

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