### 8.43. Fattal et al. 2002

#### 8.43.1. Overview

شكل 16.198. “Fattal et al. 2002” tone mapping example

Original image

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.

| ياداشت
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 Command

You can access this command from the main menu through Colors → Tone Mapping → Fattal et al. 2002….

#### 8.43.3. Options

شكل 16.199. The “Fattal et al. 2002” filter Dialog

Presets, Input Type, Clipping, Blending Options, Preview, Merge filter, Split view

  | ياداشت
  These options are described in قسمت 8.1.2, “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.

8.42. The “Tone Mapping” Submenu |  | 8.44. Mantiuk 2006

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