摄影.摄影胶卷的均方根粒度.测定方法

[中文适用范围]： 本国际标准描述了一种测定照相胶片固有均方颗粒度（rms-颗粒度）的方法。固有rms-颗粒度是指仅由照相乳剂中显影成像中心的分布所产生的密度波动。可以通过本国际标准所述程序测量涂布在透光载体上的连续调单色（银吸收物质）和彩色（染料吸收物质）材料。本国际标准适用于观察放大倍率在5倍至12倍之间的成像系统（见附录A）。本国际标准不涵盖以下种类的颗粒度测量，尽管它们在摄影上很重要：反射材料（照相纸）；在载体两侧涂布乳剂的材料（例如某些X射线胶片）；噪声功率谱（维纳谱）的估算。 [外文原描述]： ISO 10505:2009 describes a method for determining the intrinsic root mean square granularity (rms‑granularity) of photographic films. Intrinsic rms-granularity refers to those density fluctuations produced solely by the distribution of developed image forming centres in the photographic emulsion. Continuous-tone monochrome (silver absorbing species) and colour (dye absorbing species) materials coated on a transmitting support can be measured by the procedures described in ISO 10505:2009. ISO 10505:2009 is intended for imaging systems with viewing magnifications between 5x and 12x (see Annex A). The following kinds of granularity measurements are not covered by ISO 10505:2009, even though they are photographically important: reflecting materials (photographic papers); materials having emulsion coated on both sides of the support (e.g. some X-ray films); the estimation of the noise power spectrum (Wiener spectrum).