---
name: "exrnlm"
section: "1"
platform: "linux"
package: "exrtools"
version: "0.4-1.2+b2"
release: "Debian 8 (Jessie)"
platforms: ["linux"]
url: "https://new.carta.tech/exrnlm"
---

# exrnlm(1)

perform non-linear masking correction on an OpenEXR image

## NAME

exrnlm - perform non-linear masking correction on an OpenEXR image

## SYNOPSIS

**exrnlm** input.exr blur.exr output.exr

## DESCRIPTION

Performs the non-linear masking function described in this paper:

N. Moroney. *Local Color Correction Using Non-Linear Masking.* IS&T 8th Color Imaging Conference, 108-111 (2000).

The input image should be normalized, and the whitepoint image should be at the same scale factor as the input image.

## AUTHORS

Billy Biggs \<vektor@dumbterm.net\>.

## SEE ALSO

[**exrtools**(1)](/exrtools/1.md).