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

# exrpptm(1)

performs tone mapping on an OpenEXR image (photoreceptor)

## NAME

exrpptm - performs tone mapping on an OpenEXR image (photoreceptor)

## SYNOPSIS

**exrpptm** \[*options*\] input.exr output.exr

## DESCRIPTION

Performs the tone mapping function described in this paper:

Erik Reinhard and Kate Devlin. *Dynamic Range Reduction Inspired by Photoreceptor Physiology.* IEEE Transactions on Visualization and Computer Graphics (2004).

The input image should be normalized, and the output file returned by this function should also be normalized before viewing.

## OPTIONS

- \-f

  **Controls the intensity of the resulting image.  Valid range is from -8** to 8, defaulting to 0.\

- \-m

  **Controls the contrast of the resulting image.  Valid range is from 0.3** to 1.0.  The default value of 0 uses an algorithm to calculate an appropriate m factor for the image based on its luminance.\

- \-c

  **Amount of chromatic adaptation to apply to the image.  Valid range is** from 0 meaning no chromatic adaptation to 1 meaning fully adapted. Defaults to 0.\

- \-a

  **Controls the light adaptation.  Valid range is from 0 meaning that the** adaptation is global to 1 meaning that the adaptation is based on pixel intensity.  Defaults to 1, to trade detail visibility for contrast.

## AUTHORS

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

## SEE ALSO

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