The high and low are the same, so the full DR range is contained within whatever method is used to store the data, but in a Log profile the capture data has a logarithmic curve applied to the sample spacing, meaning compared to the sensor linear output and normal raw files, the number of highlight tones is sacrificed in favor of more shadow tones. So what's the detailed difference between a 'normal' capture and a Log capture? The distribution of tonal sampling. Log's do not and cannot add native dynamic range off the sensor. No Log does, it is just a different way of sampling the same data coming off the sensor. Yes and none of that adds any dynamic range. Now in reality it hasn't been as bad as some people thought, plus the advantages of having more stops of information seem to outweigh the banding issues, but it is still an issue until you move up to 10-bit." There has always been some concern about recording log gamma in 8-bit codecs, if you try and cram too many stops of luminance into 8-bit, you may get banding artifacts on gradients. Think of it this way, if the sensor, the recording, and the display device are all linear, no gamma curves applied, and the sensor can capture 14 stops and the display can show 11 stops, then is it better if the recording has 14 stops in it or 11 stops in it? What's the point of three more stops of information if you can't display it? Well, one advantage is that you can apply gamma curves, power windows, luminance keys, and knee and shadow compression to allow bright highlight detail and dark shadow detail outside of the display device's range to burn off to white (clip) or fall off into black more gradually while leaving the midtones with a more linear response to light. "Those extra stops are what the sensor is able to capture. "This Log curve offers more dynamic range then the original S-Log curve" REAL C-LOG can prevent highlights and shadows from clipping.Ĭanon log (C-log) gamma profile preserves the most color and luminance data from the sensor.
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