8.44. Fattal et al. 2002
8.44.1. Overview
Figure 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.
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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
Figure 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 Section 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 Section 8.1.1, “Colors Common Features”.