High Dynamic Range Image tutorial in Photoshop CS

Short Description
In this tutorial, I won’t go into the technical and physical backgrounds of High Dynamic Range Image. Instead, I’ll present you with a basic instruction about the photography of the images needed to produce HDRI’s, the way to go about in Photoshop (which in CS2 has a feature incorporated that will produce a so-called Radiance document with little effort) and how to use the HDRI in 3D (I use Cinema4D but other software will differ only slightly)

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Content
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Just a little background though: Did you notice that on a sunny day, your camera tells you that you need 1/30 seconds of exposure with a 2.8 lens opening indoors and when you step outside it just needs 1/1000 seconds at f11. In fact the difference between complete darkness and complete “lightness” is pretty endless. A camera or your eyes can only see a portion of it without adjusting, and once they have, they can’t see as well anymore what they saw before the adjustment. When you step back inside the house it takes a second to get used to the darkness. And when you take a picture with your camera still at 1/1000 at f11, the print is black. In an HDRI, multiple situations are all combined in one image: indoor and outdoor at the same time so to say. You need a slider to make it visible to the eye, but when you do, it is all there: the sphere of the sun and the inside of a drawer.
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This tutorial cannot cover everything there is to know about HDRI-imaging. There is more to find about the subject on the internet every day. Just Google HDRI and you’re presented with a plethora of results. Some of them go into the physics, some of them into rendering, there are manufacturers who sell ready-made HDRIimages and there are many questions answered on the subject in forums. I hope I revealed the basics of making your own and use them yourself. Happy Rendering!

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