![]() The underexposure indication limit (meaning the dynamic range of the camera) can be set even more flexibly, depending on the ISO settings. You can change it to match your particular camera through Preferences – Image Display - Exposure – Underexposure detection limit. Underexposure (UnExp) is 2.45% in the Red channel, 0.29% in the Green channel, and 1.78% in the blue channel – those pixels are in the underexposure zone, that is 8EV (with standard settings) below the saturation point for the camera.ĨEV is a standard value for the photographically usable dynamic range.If no positive exposure compensation was applied (that includes automatic exposure correction, please see below “Hidden Adobe exposure compensation”), the table consists of three columns: the name of the Raw “color” channel, the percentage of underexposed pixels, and the percentage of overexposed pixels:įor the shot above, the statistics table shows that: These statistics are displayed in the Exposure stats panel, which by default is located in the right side of the program window. Exposure Statisticsįor RAW data, the exposure statistics are calculated for each channel. With this, the underexposure level indicator stays in place because the quality of the shadows doesn’t change with the change of exposure compensation. During a negative exposure adjustment, the axis shift is in the opposite direction. During a positive exposure adjustment, the EV0 level shifts in the direction of the shadows (because the shadow sections shifts to brighter ones – closer to middle gray), correspondingly the other vertical marks move as well (and if needed, the numbers for the marks change as well). When applying exposure adjustment (see below) the histogram itself does not change – instead the horizontal axis shifts. The histogram step on the horizontal axis is 0.1EV, so there will always be a “comb” in the shadows, as there are less possible levels than 10 levels per stop. The leftmost mark of the scale is the level that corresponds to the value of “1” in the RAW data. ![]() ![]() +3 (when exposure adjustment is turned on it can be +2 or +1) – extreme highlights.-5 – the level that corresponding to the level of the underexposure indication (see below).If exposure adjustment has not been applied, it’s set to 3 photographic stops below the saturation level of a camera. EV0 – the level that corresponds to the middle gray.The RAW-data histogram is created based on the unmodified (disregarding any exposure adjustments metadata) RAW data from the file: Automatic setting of positive (lightening) exposure adjustment.Showing the areas of over- and underexposure on the image.FastRawViewer offers several tools to analyze the exposure on a photograph, recommend exposure adjustments during a shooting session, and select exposure adjustment during RAW conversion:
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