![]() If you use this technique, the 5D Mark IV gains around 1 stop of usable DR making it one of the highest DR lattitude cameras in the 35mm realm. ![]() There will be slight parallax error in between the two images, so be prepared to mask and edit selectively between the two files.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: Unlike bracketting or even pixel shift methods, this happens all in one exposure eliminating motion blur.Showing the areas of over- and underexposure on the image.Automatic setting of positive (lightening) exposure adjustment.The RAW-data histogram is created based on the unmodified (disregarding any exposure adjustments metadata) RAW data from the file:.EV0 – the level that corresponds to the middle gray.If exposure adjustment has not been applied, it’s set to 3 photographic stops below the saturation level of a camera.-5 – the level that corresponding to the level of the underexposure indication (see below).+3 (when exposure adjustment is turned on it can be +2 or +1) – extreme highlights.The leftmost mark of the scale is the level that corresponds to the value of “1” in the RAW data.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. When applying exposure adjustment (see below) the histogram itself does not change – instead the horizontal axis shifts. 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). During a negative exposure adjustment, the axis shift is in the opposite direction. With this, the underexposure level indicator stays in place because the quality of the shadows doesn’t change with the change of exposure compensation. Exposure Statisticsįor RAW data, the exposure statistics are calculated for each channel. 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.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.
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