Ahhh, Finally decided to throw together a HDR tutorial. Its not as in-depth as some of my other tutes, but describes the overall process I use. I created a rendering just for this tutorial, one that I thought would work well for HDR processing with lots of textures, i.e. grasses, and a cloudy sky.
For those who aren’t familiar with HDR images, it is a process of combining multiple copies of the same image, each with a different exposure, to produce a final image with a higher dynamic range. It essentially gives the image more detail in both the dark and light areas. This process is commonly used in photography where you can set the camera to bracket the photos and automatically take 3 pictures with different exposures of the same shot. The issue with applying this technique to illustrations is that there is only one image to work with. I work around this by taking the image into Photoshop and manually adjusting the exposure.