FastRawViewer Software 2.0 (Download) - Manual (Page 69)

FastRawViewer – user manual
Page 69 of 175
Copyright © 2014-2016, LibRaw LLC, www.libraw.com
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.
Exposure Statistics
For RAW data, the exposure statistics are calculated for each channel. These statistics are displayed
in the Exposure stats panel, which by default is located in the right side of the program window.
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:
For the shot above, the statistics table shows that:
1. 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 below the
saturation point for the camera.
2. Overexposure (OvExp): no overexposure.