8.43. Fattal et al. 2002

8.43.1. Overview

Рисунок 16.212. «Fattal et al. 2002» tone mapping example

«Fattal et al. 2002» tone mapping example

Original image

«Fattal et al. 2002» tone mapping example

Filter applied with default settings, after changing image precision in GIMP to 32-bit floating point linear light.


This filter can be used to adapt an image, which may have a high dynamic range (HDR), for presentation using a low dynamic range. This operation reduces the magnitudes of local image gradients, producing luminance within the range 0.0-1.0.

This tonemapping approach was originally presented by Raanan Fattal, in the 2002 SIGGRAPH paper: Gradient Domain High Dynamic Range Compression.

[Примітка] Примітка

This filter is slow on larger images. For finding the best settings for your image you could make a small relevant selection first and save that as a preset before using that for the whole image.

8.43.2. Activating the Filter

This filter is found in the main menu under ColorsTone MappingFattal et al. 2002.

8.43.3. Options

Рисунок 16.213. The «Fattal et al. 2002» filter Dialog

The «Fattal et al. 2002» filter Dialog

Presets

«Presets» are a common feature for several Colors commands. You can find its description in Розділ 8.1.1, «Colors Common Features».

Alpha

Gradient threshold for detail enhancement.

Beta

Strength of local detail enhancement.

Saturation

Global color saturation factor.

Noise

Gradient threshold for lowering detail enhancement.

Input Type, Clipping, Blending Options, Preview and Split view

These are common features described in Розділ 8.1.1, «Colors Common Features».