In real life a 12-bit camera may not reach 4095 maximum even for a grossly overexposed shot also, some cameras we consider to be 12-bit may have maximum values slightly larger than 4095. For a 12-bit camera (when we say 12-bit we mean the camera has a 12-bit analog-to-digital converter, ADC) RAW data for every pixel can assume values ranging from 0 (the pixel was not affected by light in any way or the effect was below the lower limit of the range) to 2 12 -1 = 4095 (the RAW data for the pixel has been clipped, or the pixel being saturated - that is, the pixel charge is above the upper limit of the range).
Suppose that the camera we used is a 12-bit one.
#Rawdigger photography life iso#
Each value in the set is nearly (less noise, flare, and effects at deep shadows and extreme highlights) directly proportional to the value of the light intensity, measured by the corresponding pixels of the camera sensor during exposure.Īs with any measurement device, light measurements here are also only within the certain range (the ranges can be switched, that is where the ISO setting often comes to play). What there is a set of RAW values, which are measurements of light, as if the sensor is composed of many light meters – one at each pixel location. When we shoot in RAW, then, if we use the common meaning of “picture” (as in something that can be directly viewed), there is none. It is a rendition of the raw data, not the raw data itself.
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