TRD-2 | TRD-4 | TRD-Z | Options | Software Heiland TRD-4 Black and White Densitometer with % Dot Density FunctionThis model is mainly used for pre-press and press applications such as the calibration of RIPs and printers. After setting Dmin and Dmax, densities can be displayed in units of percentage dot density or in log.D units.
TRD-2 | TRD-4 | TRD-Z | Options | Software Heiland TRD-Z Black and White Densitometer with Zone System FunctionsDesigned specifically for Zone System applications the TRD-Z acts like an electronic zone ruler, displaying reflection measurements in terms of ten zones between Dmin and Dmax, and transmission measurements in zones according to selected film development. In the reflection measuring mode (print analysis), the range of grey tone values of a print are classified into ten different zones with ten increments each. Pressing the "minimum" button while measuring paper-base white will give a display of zone 10.0. Conversely, reading the lowest reflectance and pressing "maximum" will show a reading of zone 0.0 and is subsequently stored as such. In subsequent measurements within the same picture, the grey tone values are given in 1/10 zones. In the mid-range of values, for example, a reading could show "zone 5.3". The TRD-Z then serves to replace a visual zone ruler by exact figures, in effect becoming an extremely accurate "electronic zone ruler". For transmission measuring (negative analysis), the zone system refinement of variable film development can be taken into consideration. Separate measuring modes are provided for each of the developing variants: "N" (normal); N +1; N +2; N -1; N -2. The slope of each individual characteristic curve is taken into account by computer calculation. In practical use, here's how it may be helpful: The instrument is first nulled by placing a unexposed portion of the negative ("film base plus fog") under the probe and pressing the "minimum" button. The display will show zone "0.0". Now for example, if an area with a density of log 1.02 above basic fog is measured and if the processing category "N" is selected, the displayed zone would be 6.0. For the other processing categories, the following zone values will be indicated (assuming an equal density): The TRD Z replaces "graytone guessing" with exact measurements. These accurate values then give the user a clear and easy way to appreciate the benefits of the zone system.
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Various Models to suit your Specific Requirements