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FastRawViewer displays unprocessed RAW histogram: no white balance, no contrast curve (and exposure adjustment moves horizontal scale relative to fixed histogram). Horizontal scale is in photographic stops (EV). This type of histogram is targeted for culling (i.e. exposure evaluation of different frames)

C1 (and most other RAW editors) displays histogram of processed image: with applied WB, contrast curve, exposure adjustments. Histogram changes when you change parameters applied. Horizontal scale is (most probably) linear in 'source RGB values' (so gamma corected). This type of histogram  is targeted for editing (of already selected image)


Alex Tutubalin/FastRawViewer team