---
name: "pfsclamp"
section: "1"
platform: "linux"
package: "pfstools"
version: "2.2.0-9"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/pfsclamp"
---

# pfsclamp(1)

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

## NAME

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

## SYNOPSIS

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

## DESCRIPTION

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.

## OPTIONS

- \--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.

- \--rgb

  Perform clamping in RGB space.

## EXAMPLES

- 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)](/pfsin/1.md) [**pfsout**(1)](/pfsout/1.md)

## BUGS

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