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一般的に,カラー複写機やカラープリンタの色補正処理は,入出力デバイスの特徴を記述した色補正テーブルを用いて行われる。しかし,デバイス間の色の関係は,非線形性が強く,一つのアルゴリズムで満足するような色補正テーブルを作成することは難しい。そのため,一度作成した色補正テーブルに対して所望の色を得るように微調整する必要があることが多い。今回は視覚的に均等な色空間において色調整を行い,トーンギャップや色とびがない,色補正テーブルを修整する手法を提案する。
Color management for color copiers and color printers is often performed
using a color correction table, which is constructed based on measured
characteristics of an input and an output device. Color input and
output devices often have dissimilar color gamuts, so the mapping
function for reproducing the colors of an input device on an output
device is usually a compromise, and this function has strong nonlinear
characteristics. Since it is difficult to generate an optimum color
table using a generic algorithm, it becomes necessary to adjust or
modify the color correction table created by the generic algorithm,
to make reproduced colors more pleasing or preferable. This paper
describes a method of editing a color conversion table in a uniform
color space. By using this method, visible tone gaps (contouring)
and tone jumps that may exist in the table produced by the generic
algorithm can be reduced or eliminated. |
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