Photomatix Pro 2.2 Help 7
VI - Processing HDR images
Introduction
An HDR image generated from differently exposed image can not be viewed properly on standard
monitors or on prints. This is because this "raw" HDR image contains a range of values from the
deepest shadows to the brightest highlights that exceeds the reproducing capacity of low dynamic
range media such as standard monitors.
This is why is it necessary to process the HDR image, mapping its tonal values so that they fit in the
limited tonal range of display and printing devices. This way, the details in highlights and shadows
stored in the 32-bit HDR image become then apparent on 8-bit displays. For instance, an HDR image
with a dynamic range of 100,000:1 will be converted to an 8-bit image (which range is at most 255:1).
This process is also known as Tone Mapping.
The Tone Mapping tool of Photomatix works from one image that can be either:
- An HDR Image
- A 16 Bits/Channel image
The HDR image is either generated in Photomatix from differently exposed shots, or opened as a file
in one of the following HDR image formats:
- Radiance RGBE (.hdr)
- Open EXR (.exr)
- Floating Point TIFF
To use the Tone Mapping tool from the interface:
1.
Generate an HDR image or open an already existing HDR Image or 16-bit TIFF file.
2.
On the HDRI menu, click the Tone Mapping item.
Tone Mapping settings
Luminosity
Adjusts the brightness of the shadows. Moving the slider to the right has the effect of boosting shadow
details and brightening the image. Moving it to the left gives a more natural look to the resulting image.
Strength
Controls the strength of local contrast enhancements. A value of 100% gives the maximum increase in
local contrast.
Color Saturation
Controls the saturation of the RGB color channels. The greater the saturation, the more intense the
color. The value affects each color channel equally.
White Clip - Black Clip
Both sliders control how the minimum and maximum values of the output image are set. Moving the
sliders to the left increases global contrast. Moving it to the left reduces the clipping at the extremes.
The White Clip slider sets the value for the maximum (pure white or level 255). The Black Clip slider
sets the value for the minimum (pure black or level 0).
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