Photoshop CS2: HDR images
High Dynamic Range imaging (HDRI) is a set of techniques that allow a far greater dynamic range of exposures (i.e a large difference between light and dark areas) than normal digital imaging techniques. This opens up a whole new set of lighting possibilities, as the intention of HDRI is to accurately represent the wide range of intensity levels found real scenes ranging from direct sunlight to the deepest shadows.
How does traditional digital images differ from HDR images?
Information stored in high dynamic range images usually corresponds to the physical values of luminance or radiance that can be observed in the real world. This is different from traditional digital images, which represent colors that should appear on a monitor or a paper print. Therefore, HDR image formats are often called “scene-referred”, in contrast to traditional digital images, which are “device-referred” or “output-referred”. Furthermore, traditional images are usually encoded for the human visual system (maximizing the visual information stored in the fixed number of bits), which is usually called “gamma encoding” or “gamma correction”. The values stored for HDR images are often linear, which means that they represent relative or absolute values of radiance or luminance (gamma 1.0).
High Dynamic Range imaging is currently extremely popular among professional and amateur photographers. Besides, it isn’t a complicated process any more.
To create a HDR image, you need:
- A digital camera that allows you to set exposure manually.
- A sturdy tripod.
- A computer with Photoshop CS2 installed
Although there are some other programs available that allow to create HDR images, the “merge to HDR” feature of Photoshop CS2 is considered the best and is highly recommended by most professional photographers. It allows the user to combine a series of bracketed exposures into a single image which encompasses the tonal detail of the entire series.
Online Tutorials:
How To Create High Dynamic Range Images - Tutorial Compares Photomatix and Photoshop CS2 Bridge
High Dynamic Range (HDR) in Photography - Implementation in Photoshop CS2
Introduction to HDR with Photoshop CS2 - Using Photoshop CS2 to create 32-bit HDR images
How to Create Professional HDR Images with CS2 - Step-by-step illustrated tutorial for creating HDR and tone-mapped images with Photoshop CS2
Exposure Bracketing Technique for HDR Photography
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