White (90% reflectance) is 61% IRE so much lower than Rec709.Middle Grey (18% reflectance) is still 42% IRE as standard Rec709.Dark values are not compressed until IRE=18%.0 input reflectance is mapped to 7.3% IRE.There are few implications of this formula that are important: If you consider the input reflection (in) you can see how the output is related to the input using two formulas: This is well documented in Panasonic V-Log/V-Gamut technical specifications. Panasonic V-LOG/V-GamutĪ logarithmic operator is a non-linear function that processes the input signal and maps it to a different output value according to a formula. I will aim at making this write up self-contained so you have all the information you need here without having to go and search elsewhere, it is not entirely possible to create a layman version of what is after all a technical subject.
Some of what you will read may be a surprise to you so I have provided the testing methods and the evidence so you can understand if LOG is something worth considering for you or not. In this short article I will explain how the Panasonic V-Log actually works on different cameras. There is no doubt that LOG formats in digital cameras have a halo of mystery around them mostly due to the lack of technical documentation on how they really work.
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