FastRawViewer Software 2.0 (Download) - Manual (Page 68)

FastRawViewer – user manual
Page 68 of 175
Copyright © 2014-2016, LibRaw LLC, www.libraw.com
Working with Exposure
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:

RAW-histogram.

Over/Underexposure statistics.

Showing the areas of over- and underexposure on the image.

Automatic setting of positive (lightening) exposure adjustment.

Manual Exposure adjustment setting.
Histogram
The RAW-data histogram is created based on the unmodified (disregarding any exposure
adjustments metadata) RAW data from the file:
Horizontal Scale:

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 corresponds to normal clean easily workable shadows for the majority of
modern cameras.

+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.