In other words, the curves tool only redistributes contrast. The key concept with curves is that you can never add contrast in one tonal region without also decreasing it in another. In summary: tonal curves are required for every image in one form or another - whether this be by our eyes, the film emulsion, digital camera, display device or in post-processing. On top of this, each type of digital sensor has their own tonal response curve, and even PC/Mac computers apply a different tonal curve when displaying images (gamma). The camera therefore has to apply its own tonal curve to the RAW file format to maintain accuracy. Furthermore, while our camera (ideally) estimates the relative amount of photons hitting each pixel, our eyes/brain actually apply a tonal curve of their own to achieve the maximum visual sensitivity over the greatest lightness range.
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