---
name: "vig_optimize"
section: "1"
platform: "linux"
package: "hugin"
version: "2025.0.1-5"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/vig_optimize"
---

# vig\_optimize(1)

Optimise photometric parameters

## NAME

vig\_optimize - Optimise photometric parameters

## SYNOPSIS

**vig\_optimize** \[options\] **-o** *output.pto* *input.pto*

## DESCRIPTION

Photometric calculation can be performed on the command-line with the vig\_optimize tool. This functionally is configured via 'v' variable lines in the .pto project file in a similar way to the autooptimiser tool:

The camera response curve is simplified using the EMoR sensor model which reduces the variation to five numbers, these are the Ra, Rb, Rc, Rd & Re image (i) parameters (the default values of 0.0 are equivalent to an 'average' generic sensor).

The vignetting model is represented by a polynomial with four parameters: Va (this is always 1.0 and doesn't need to be optimised) and Vb, Vc & Vd (which default to 0.0 - equivalent to no vignetting). The vignetting centre can also be different from the geometrical centre, this is specified by Vx & Vy (both default to 0.0).

Exposure (EV) is represented by a single value Ev (defaults 0.0, equivalent to no-change).

The white balance is represented by multipliers for the red and blue channels Er and Eb (the defaults of 1.0 are equivalent to no-change).

A typical 'v' variable line configuration would look like this, i.e. optimise camera response curve and vignetting for image 0 and exposure for images 1, 2, 3 and 4:

```
  v Ra0 Rb0 Rc0 Rd0 Re0 Vb0 Vc0 Vd0
  v Ev1 Ev2 Ev3 Ev4
```

(vignetting centre and white balance are left unchanged)

## OPTIONS

General options:

- **-o** *file*

  Write results to output project

- **-v**

  Verbose, print progress messages

- **-p** *n*

  Number of points to extract

- **-r**

  Extract random point (faster, but less accurate)

- **-s** *level*

  Work on downscaled images, every step halves width and height

- **-h**

  Display help summary.

Expert and debugging options:

- **-i** *file*

  Read corresponding points from file

- **-w** *file*

  Dump corresponding points to file

## AUTHORS

Written by Pablo d'Angelo. Also contains contributions from Douglas Wilkins, Ippei Ukai, Ed Halley, Bruno Postle, Gerry Patterson and Brent Townshend.

This man page was written by Cyril Brulebois \<cyril.brulebois@enst-bretagne.fr\> and is licensed under the same terms as the hugin package itself.