8.44. Fattal et al. 2002

8.44. Fattal et al. 2002
	8. The “Colors” Menu

8.44.1. Overview

图 16.230. “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.

	注意
	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.

8.44.2. Activating the filter

This filter is found in the image window menu under Colors → Tone Mapping → Fattal et al. 2002.

8.44.3. Options

图 16.231. The “Fattal et al. 2002” filter Dialog

Presets: “Presets” are a common feature for several Colors commands. You can find its description in 第 8.1.1 节 “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 第 8.1.1 节 “Colors Common Features”.