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pfsclamp - Man Page

Clamp color and luminance channel values to be within the specified range


pfsclamp [--min <minimum>] [--max <maximum>] [--percentile] [--zero] [--rgb]


Use this command to clamp values of luminance and color channels to be within the specified range. I.e. if a value in the channel is above the specified maximum or below specified minimum, set the value to either minimum or maximum.

The command operates directly on XYZ channels.


--min <val>

Lower bound for clamping. Default value: 0.0001 (10^-4)

--max <val>

Upper bound for clamping. Default value: 100000000 (10^8)

--percentile,  -p

Treat given min and max values as a percentile.

--zero,  -z

Set values out of clamping range to zero, instead of setting to specified maximum and minimum.


Perform clamping in RGB space.


pfsin memorial.hdr | pfsclamp | pfsout memorial_cl.hdr

Remove possible out-of-range values, for examples zeros, from memorial image.

pfsin memorial.hdr | pfsclamp --max 0.95 -p | pfsout memorial_cl.hdr

Remove 5% of the brightest pixels from the original image.

See Also

pfsin(1) pfsout(1)


Please report bugs and comments to Rafal Mantiuk <mantiuk@mpi-sb.mpg.de> and Grzegorz Krawczyk <krawczyk@mpi-sb.mpg.de>.

Referenced By

luminance-hdr(1), luminance-hdr-cli(1), pfstmo_mantiuk06(1).