In the final analysis, however, the camera's meter is irrelevant to ETTR since the ETTR exposure is established, not by a meter reading, but by the camera's exposure indicators, the histogram and/or the highlight-clipping indicators (blinkies/zebras).ĮTTR images requiring increased exposure may appear to be overexposed (too bright) when taken and must be correctly processed ( normalized) to produce a photograph as envisaged. When attempting a single-exposure of a high dynamic-range scene, a reduction in exposure from the meter's reading may be needed. Typically, with low-contrast scenes, an increase in exposure over that indicated by the camera's meter will be required. The direction of the relative adjustment to the camera's meter reading depends on the dynamic range (or contrast ratio) of the scene. Advantages include greater tonal range in dark areas, greater signal-to-noise ratio (SNR), fuller use of the colour gamut and greater latitude during post-production. The name derives from the resulting image histogram which, according to this technique, should be placed close to the right of its display. Details in the shadows are already discernible and the flowers are fully recoverable in post-production.
An image exposed to the right (+1 EV) and its histogram. Details in the flowers are already discernible but recovering the shadows in post-production will increase noise. Photographic technique A normally exposed image and its histogram.
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