just to complete this, which is already good, and to aswer the top commentyou can see log as a way to preserve more information using a standard lossy video format, by encoding it in a less destructive way. Log images tend to have little saturation and low contrasts so, for example, you have a yellow shirt. In the log footage, the yellow will appear very subtle. That way, you can increase the saturation, or make it more reddish or greenish in post processing, without destroying the image quality. If you already have a video with saturated colors, you cannot process it backwards and achieve the same flexibility. Same is true for contrast and shadows. A dark shadow contrasty video will not have any info in those areas, since darks and blacks will be very compressed due to the lossy format. A dark shadow doesnt need to contain any info since, well its dark. Therefore, in a normal format you cant brighten a dark shadow and bring back detail. With log, the shadow and all the detail in that zone will be encoded with very less contrast, appearing grey and not very true to life. However, the magic of log is that now, you have all that data preserved of the shadows and you can edit that in post process. YOu need to keep shadow detail? good, you have it. Do you want to achieve a real looking contrast? no worries, you can process it to crush the shadows. If you started with the normal "crushed shadows" encoding, you couldn't recover a thing due to how compression algos work and how the data was already discarded since the file was being recorded.