reflection

reflection (In French réflexion) controversially defined phenomenon describing the casting back of light waves and simultaneous weakening of the luminous flux. 1. Illogical differentiation in designation between specular/regular reflection (réflexion spéculaire/pure) as “reflection” and diffuse reflection (réflexion diffuse) as “remission”, which is why the bvdm only mentions reflection in its German Media Standard Print. 2. What speaks out against this, however, is the worldwide common designation “spectral remission factor”, which results from the measurement of the diffusely reflected part of light (“remission”) in color measurement, which justified the following distinction: Reflection means the casting back of the waves with reference to the surface structure, which leads to a specular and a diffuse part, which can be shown in a so-called indicator; 2a) The gloss or mattness/roughness of the surface is evaluated by the gloss angle; the lower the reflectance factor (réflectance, facteur de réflexion), the matter/rougher the surface. 2b) The densitometric variables (measured using a polarizing filter, which eliminates residual gloss from wet color surfaces) are determined using the gloss-free angle. 2c) When the density spectrum is recorded, the spectral absorptance is measured and the highest point of the absorption curve is determined as the standard for the ink film thickness, so that the remaining scanned spectrum is irrelevant, so that one can talk of neither reflection nor remission, but rather of a maximum absorption at the determined wavelength.