RMS Granularity - RMS Granularity

Japanese: RMS 粒状度 - あーるえむえすりゅうじょうど
RMS Granularity - RMS Granularity

The RMS granularity is a measure of the graininess of a photograph, which is measured by scanning the image with a microdensitometer to determine the root mean square of the density deviation at multiple measurement points.
[Sharpness]
The sharpness of a photographic image depends on the performance of the camera lens and film used to take the picture, as well as the conditions under which the film was developed and the conditions under which it was printed when a positive was made from a negative. To improve the sharpness of the final photographic image, it is necessary to examine the entire system from shooting to finishing.

*Some of the terminology that refers to "RMS granularity" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…また,拡大した写真像を種々の距離で観察し,粒状の識別される限界の距離を求める方法もある。物理的粒状性を求めるには写真像をマイクロ濃度計で走査して多数の測定点の濃度の偏差の2乗平均根を求める方法があり,この方法で求めた粒状はRMS粒状度という。
[鮮鋭度]
 写真像の鮮鋭度は,撮影に用いるカメラのレンズの性能とフィルムの性能のほか,フィルムの現像条件とネガからポジを作る際の焼付け条件などによって異なり,最終的に得られる写真像の鮮鋭度を良くするには撮影から仕上りまでの全体のシステムについて吟味する必要がある。…

※「RMS 粒状度」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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