Photomatix Pro 2.2 Help 5
IV - Exposure Blending
Introduction
Photomatix lets you combine images with different exposures using the Average method or one of the
Highlights & Shadows methods. Those latter methods perform a process known as Exposure Blending
The Highlights & Shadows methods make use of advanced algorithms to select and blend together
the details available in the different exposures.
The Average method combines the images using the same average formula everywhere, regardless
of whether the computed pixels are in a dark or bright area. This is why averaging can not produce the
dynamic range extension that you can get with one of the Highlights & Shadows Exposure Blending
methods. However, averaging has the effect of reducing noise and is often used for a process called
Image Stacking.
To use the Exposure Blending functions of Photomatix Pro
1.
Open the images taken under different exposures.
2.
On the Combine menu, click one of the Highlights & Shadows item. For help on choosing an
item, see the section “Which one of the Highlights & Shadows combination methods should I
use?” under the FAQ document.
3.
The window lists the source images (see note below) that will be combined into one image with
details in highlights and shadows. If the images are not aligned (e.g. shot without the aid of a
tripod), check the option Align images.
4.
Save the result.
To blend exposures automatically and/or process large files, please refer to the section “Batch
Processing”.
Notes:
Source images
-
All image files that you have opened, excepted images in Radiance RGBE format, are considered
source images. source images should be images of the same scene taken under different
exposure settings. Once you have combined source images or applied tone mapping to an HDR
image, the resulting images are not considered source images. This way, you can easily compare
the results of different combination methods by running them successively on the same source
images without having to close the window showing the previous result.
-
If the source images do not have the same size, the resulting image is computed based on the
size of the smallest source image.
-
To function properly, the combination requires that the source images are perfectly aligned. Even
though Photomatix provides automatic and semi-manual/advanced alignment tools, it is
recommended to use a tripod when shooting the different exposures. A tripod is less necessary if
your digital camera has an automatic bracketing function and you make sure that the camera does
not move during shooting.
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