| The G&D system (patent applied) establishes a proper relationship between densities and IRE, forming a curve (gamma) of film to tape transfer. This permits repeatability and accuracy in transfer- the major problem for the DP and telecine colorists. Repeatability and accuracy in the transfer saves time and money and satisfies the aspirations of creators (DP, directors, art directors, producers).
The curve of the transfer has been established by analyzing and comparing empirical visual and technical data. The result was the creation of the scale in which certain densities are correlated with interdependent IRE, which are printed directly on the same scale (patent applied).
The 10 IRE mark and 90 IRE mark correspond to the useful range of the negative to be transferred to video. While the absolute range of the video transfer from negative lies between marks 7.5 and 100 IRE, the Thorough Control System uses 10-90 IRE. Our research indicated a need to leave room for possible adjustments during the final "on-line" transfer of the negative.
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The other system does not
establish any contrast of transfer standards, suggesting the same old
empirical approach based on the old TAF strip and slightly modified
grey scale. Moreover, this system is taking in consideration only a
rather unusual range of IRE from 72 to 4 units.
First, IRE below 7.5 is "illegal". Secondly, the range of IRE from 72 to 100 units is a very important area where highlights are.
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