mesopic vision (In French vision mésopique/crepusculaire) simultaneous activity of the two types of retinal receptors (rods and cones) in the luminance range of 0.1 and 30 cd/m².

measurement aperture (In French diaphragme) opening through which optical measuring devices record the measured values, and also illuminate the sample when measurements are taken with reflected light. The larger the diameter, the more representative the value basis. Such an integral measuring principle is especially practical when the measured object is not homogeneous, e.g. a screened surface. For particularly narrow ink control strips in rotary offset printing, Techkon, for example, also offers small or even slit-shaped…

MDB, minimally distinct border (In French seuil de différenciation) during color matching, a limit value at which a structural difference can just be perceived between the reference and the sample; minimum distinction = maximum blur.

MCS, multi-color separation hifi color process developed and patented by eder gmbh, Ostfildern (D) (ederMCS.de), in which not only the secondary colors RGB but also their respective neighbors to the process colors CMY are available as pure special colors. The total of 12 hues can be screened as independent color separation files/prints, whereby no more than 3 special hues are usually included as CMYK supplements.

matt, dull, depolished (In French mat) property of non-shiny surfaces which favor the diffuse eflection and are thus preferred for color-matching booths, measuring standards (matt white) and the internals of measuring devices.

mask (In French masque) in image processing and graphics programs, an area determined by its outer line which isolates image areas according to their shape, whereby the form is shown by greater color differences at the edges of the object. The selected areas can be saved as separate clipping paths or (insofar as the graphics file format has an alpha channel) as integrated transparency instructions. In the masked areas, manipulations like color corrections, blurring /…

Manufacturer Registry (In French registre de fabricants) abbreviations and identification numbers on the basis of which the profile and software commentaries of the ICC member companies are identifiable, e.g. ADBE-41444245 (Adobe), APPL-4150504C (Apple), bICC-62494343 (basICColor), EPSO-4550534F (Epson), NEC-4E454320 (NEC) etc.

macula of retina, (In French macula lutea macula lutea, tache jaune) area of the retina which has the highest density of receptors and which has a great influence on the color perception of the 2° standard observer. In the inside of the macula of retina there is also the fovea, the area of the retina with the sharpest vision. The macula of retina must not be confused with the blind spot (entrance of the optic…

M3 “Measurement with polarization filter” spectral absorption degree (with RGB filters) or spectral lumi – nance factor (with spectral scanning head) with polarization filter pair (in radiated and in reflected light, crossing each other) under a light source that simulates any standard illuminant (gas lamp or LEDs, from 420 to at least 700 nm). The physical simulation of D50 (in M1) was first realized in a hand-held measuring device in the Konica Minolta FD-5/-7; the…

M2 “Color measuring mode UV Cut” spectral luminance factor without polarization filter under a light source that simulates any standard illuminant without UV component (gas lamps with UV cut-off filter < 400 nm or LEDs without UV LED, from 420 to at least 700 nm)

M1 “Color measuring mode D50” spectral luminance factor without polarization filter under a light source that simulates standard illuminant D50 with correct UV component < 400 nm (theoretically F8 fluorescent lamp, in practice only LEDs incl. UV LEDs, 5003 ± 100 K, under 380 to at least 700 nm)

M0 “Color measuring mode A” spectral luminance factor without polarization filter under a light source that simulates standard illuminant A (gas lamps or LEDs, 2856 ± 100 K, from 420 to at least 700 nm)

MacAdam’s ellipses (In French ellipses de MacAdam) threshold ellipses that characterize the experimentally determined acceptances of just noticeable differences (JND, seuil de différenciation visuelle) around selected chromaticity coordinates in the CIE chromaticity chart CIExyY. These experiments were and are the basis for the creation of perceptually equidistant color systems like CIEUCS or CIELAB, in that these ellipses are transformed into equally large circles. This means that if the customer and the printing service provider can…

M0/M1/M2/M3 measuring mode settings in accordance with ISO 13655, which are partly or fully realized in reflectedlight color densitometers.

“M” internationally used abbreviation for absorptive primary color magenta red, thus also for the technical printing process color magenta. In large-format inkjet printing systems, the abbreviation Mm means the support of magenta with “light magenta” to enlarge the color space.