Besides minor changes and improvements within the ALEXA series the introduction of AMIRA came with a new so called “Color Core” enabling a broad feature set for users. As part of that we’re continuously improving our color science. Since the Log C output represents scene exposure values, the maximum value increases.ĪRRI always strives to deliver the best overall image quality. The reason is quite simple: When the lens is stopped down, by one stop for example and the EI setting is increased from, say, 800 to 1600, the sensor will capture one stop more highlight information. The maximum value of the Log C curve depends on the set EI value.
CINEMA GRADE HD TRANSMITTER CODE
A 10 bit signal offers a total code value range of 0 to 1023. Each curve maps the sensor signal, corresponding to 18% gray scene luminance, to a code value of 400 in a 10 bit signal. Log C actually is a set of curves for different EI values/ASA ratings. Because of fundamental differences between a sensor and negative film, however, the color characteristics remain different. The overall shape of the Log C curve is similar to the exposure curves of film negatives.
Each stop of exposure increases the signal by the same amount.
The Log C curve is a logarithmic encoding of the scene, meaning that the relation between exposure measured in stops and the signal is constant over a wide range.
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