![]() Having determined the extremes as above, I used RawTherapee’s Exposure compensation, Black, and L*a*b* Lightness controls to place zones -I and IX on L* = 0 and 100, and zone IV on L* = 50 (middle gray) as described on previous pages. Zone IV on middle gray, extremes at 0 and 100 The method above is a simple way to determine how many useful zones are recorded in the RAW image. RAW conversion adds another set of variables to the process. ![]() tif captures, constructing a zone ruler to determine the useful dynamic range is fairly straightforward. (It is easy to place them all on 0 pulling the lowest zones up to 2 takes some effort.) Once again, there is a point at which the values sharply drop off zone O is thus the lowest useful shadow zone. We would like a little more separation in the highlights than this, so zone VIII is the extent to which meaningful highlight information is recorded. Zone IX is very close to the highlight limit. Above a certain point (zone X in this series), the value will be the same for all images below this it starts to rise as you can see: EC, clipped to L* = 100 Find the Exposure compensation value where L* goes to 100. The goal is just to see how many useful zones are recorded in the RAW image.įirst, set all of the images in the series to the same Exposure values zeroing everything on the Exposure tab works best. This method is low-tech but yields results comparable to those on theĬalibration pages. ![]() ![]() Simplified Zone System Calibration for RAW Images with RawTherapeeĪ simple method of using RawTherapee to measure an exposure series of RAW images consists of merely adjusting the Exposure compensation and Black levels to see where the highlights clip and the shadows fall off. Beyond the Digital Zone System - Simplified Calibration with RawTherapee ![]()
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