色域が現在の標準規格を越える撮像および表示機器が多数研究開発されている．従って，これら規格内で検討されて来た画質の考え方を，規格を越えるものにそのまま適用出来ない状態がある．そこで本稿では，概ね視覚の色域からHDTV 色域程度まで色域を変えて画像を表示した場合に，それらの画質につい主観評価実験を行った．その結果，視覚色域の画像の画質と比較して許容される画質が得られる色域は概ねHDTV 程度であった．しかし，画質の違いは認識されているので，測色的な色再現が求められる用途には，物体色の色域程度以上の広い色域が必要である．これらの知見は今後の画像機器の持つべき特性について示唆を与える．%There are some cameras and displays of which gamut is wider than those of standards on color gamut. Therefore, it is difficult to apply conventional concept on picture quality to image devises which have wider gamut than that defined in the current standards. In the present study, when color gamut is changed from the vision color gamut to that of HDTV, picture quality of images displayed with the gamut was subjectively evaluated. In the results, a size of the gamut where acceptable picture quality is perceived is around that of HDTV. However, difference of picture quality is perceived on the limit, color gamut would be required to be wider than that of object color in fields of severe color management. The knowledge gives effective guides for developments of next generation image devises and systems.
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