exrstats(1) General Commands Manual exrstats(1)NAME
exrstats - display statistics about the contents of an OpenEXR image
SYNOPSIS
exrstats image.exr
DESCRIPTION
Displays some simple statistics about the given exr file, including the range and average value for the luminance and each colour compo-
nent, and the log of the same. The log average given is the average log value of the pixels, not the log of the average.
AUTHORS
Billy Biggs <vektor@dumbterm.net>.
SEE ALSO exrtools(1).
exrtools 0.4 December 2003 exrstats(1)
Check Out this Related Man Page
pfsstat(1) General Commands Manual pfsstat(1)NAME
pfsstat - Show frame / image statistics
SYNOPSIS
pfsstat
DESCRIPTION
This command will show a short text statistic on each image in the pfs stream. In the statistics you can find:
File - name of the input file
Width, Height - image dimensions
Minimum - minimum luminance of an image(*), given in linear
units (relative luminance in cd/m^2) and logarithmic units
Maximum - maximum luminance of an image(*)
Average - average luminance of an image(*)
Mean - mean luminance of an image(*)
(*) Before min, max, average, median and dynamic range is computed, the following processing is performed on an image: 1) negative and zero
values are replaced with the smallest positive value (to compute logarithms); 2) the image is low-pass filtered. The low-pass filtering
removes few very dark or very bright pixels that can significantly influence estimation of the dynamic range. The percentile, instead of a
low-pass filter, is sometimes used for the same purpose. However, a low-pass filter is preferred to the percentile in pfstools since, tak-
ing into account the processing that is happening in the human visual system, low-frequency band filter is more plausible.
Note: This command requires GNU Octave.
EXAMPLES
pfsin memorial.hdr | pfsstat
Show statistics for the memorial image.
BUGS
Please report bugs and comments to Rafal Mantiuk <mantiuk@mpi-sb.mpg.de>.
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