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I was finding a similar problem with Aftershot Pro. In darktable, inverting the curves gives a washed out result and even when adjusting this the image ends up clipping both highlights and dark regions. The color correction options are virtually unmatched in this type of software so that you can get into your photos more precisely. It gives you full control over images and the ability to manipulate images with greater ease. In RT I simply invert the curve, with the bottom left going to top left and the top right to bottom right, then bring in the end points of the curve to meet the histogram, with some variation depending on the tonal range of the image. RawTherapee is a viable photography option if you do work with RAW or need to alter a large load of images at once. Out of curiosity I tried darktable for this, but my attempts to invert the raw files have been failures. There are multiple alternatives in the open source world for raw development (ufraw, dcraw, rawtherapee) but darktable tries to fill the gap between the. I then bring the positive images into Gimp for cleaning up, sharpening and any fine tuning before printing. RawTherapee does an excellent job of inverting the raw files and adjusting tonal range etc. For this I use a Nikon D7100 (24 mp) for 35mm and a D800 (36 mp) for medium and large format film. A perfect free and open raw editor would look like this: The power of Darktable combined with the menu structure of RawTherapee.
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Part of my work involves sorting, scanning and archiving a large collection of historical negatives and transparencies. RawTherapee has been my primary raw converter for at least a couple of years. I have tried both programs but have more experience with RAWTherapee as Ive only recently become aware of Darktable.
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