On high-end cameras, I remember reading ISO is just metadata if this is the case, it really doesn't matter which one you use. Usually, with such a sensor you can just shoot at the lowest ISO and increase the brightness in post as you need - there is little reason to use a higher ISO, as the shadow details will not get significantly better (they will get a little better, but not much). Quote from: a1ex on September 01, 2016, 08:03:36 AM This chart appears to show an ISO-less sensor (not sure how to read it, but the increments at both top and bottom ends match the ISO increments, +/- 0.1 stops). If it's hardcoded part of the luma signal then it's a VFX removal job (and all that entails). However, it may not produce the effect you're looking for and, to be honest, it's never going to be a simple task. If the parameter (which returns a value between 0 and 3) would also have the option of returning a negative value, then this would allow for reducing sharpening (contrast) of the high frequency data, therefore blending it back into the low frequency domain. It's literally applying gain to the isolated image data, and because the values lay either side of 0 this is, in effect, a pure linear contrast. The Frequency Separation OFX Plugin only has the option of sharpening high frequency data.
You can be quite aggressive with the colour component of an image without fundamentally altering the perceptual structure, but even the slightest adjustment to the luma component stands out a mile. high frequency pattern, is often burnt into the image by the time you get to grade it. It's a tricky one, because the spatial frequency you speak of i.e.
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