Rawtherapee convert negative8/6/2023 ![]() And I love that parametric crop it comes in very handy when making a zone series. Lab adjustments, especially the CC curve for saturation, are invaluable. In particular, gives a much greater degree of control over the shadows and the Lightness controls seem to be more manageable. Overall, with the exception of Exposure Compensation, I like RawTherapee’s controls better than Adobe Camera Raw’s. Everything else was zeroed, especially Sharpening and Noise Reduction. I used the following settings to place zone O on 2 and V on 50. I am trying to keep the system calibration tools simple and reproducible,īeing as they are a controlled standard for zone system visualization, and a baseline for further adjustment.) It works well for individual images, and is the kind of thing I would probably do in Photoshop. (If necessary, exposure could be reduced further, and a curve applied to lift the degraded highlights back to white. An Exposure Compensation of -0.27 put zone IX right at L* = 100. For the D800E images, zone IX has a tiny amount of recoverable value, but it is not really useable, so I chose this as the highlight. A little bit of control over the highlight threshold is given up this way, but it seems to be workable. Lightness and Black were then used to adjust zone V and the shadow threshold. For the following examples, I decided to find the exposure control clip pointĪnd just leave it there. 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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