For small blown points such as on a person’s nose, CIELab Blending may be better but the clip point is higher. With this method, the highlight clip point comes at a fairly low exposure compensation value, and if low enough, can be ignored. For broad overexposed areas such as sky, the Blend HR method may work best. The latter, unfortunately, makes it a moving target. This point depends on the highlight reconstruction method and the white balance. This is invaluable when making calibration adjustments.īecause of how RawTherapee’s exposure control works, it is useful to know the magic point at which the highlights peg at the top. More importantly, the L* value is given as well, and as of version 4.0.12.132 it appears to be accurate (and displayed to one decimal place). The image value measurement is the 0-100 brightness value (V, sometimes called B), not 0-255 RGB values as in ACR. Roll your mouse over it to see the effect of disabling HR. The graph below is from version 4.1.1, with HR enabled. If HR is not enabled, the highlights are completely flattened when exposure goes below zero, and it is impossible to separate zone VIII from zone IX. Also important to note is that the behavior of Exposure Compensationĭepends on whether or not Highlight Reconstruction is enabled, even if Highlight Compression (formerly Highlight Recovery) is zero. Negative values of the Exposure Compensation control depress the entire top end of the curve, degrading all whites to gray. Raw Therapee differes from ACR in one important way, which requires a slightly different calibration technique. That uses ColorChecker Passport DNG profiles. I believe that it is the onlyĬonverter besides Adobe Camera Raw/Lightroom and RAW converter out there and best of all, it is open source freeware.
I have been watching it since version 2 and I think it is safe to say that, as of version 4.1, it has “arrived.” In some ways it is the most advanced Beyond the Digital Zone System - D800E Calibration with RawTherapee
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