HDR - Methodology
To create an image with a HDR (High Dynamic Range), you need to take several snapshots of the same scene without moving. The above image was created from three separate photos. The first photo was taken with normal exposure settings. The second and third photos were taken with exposure settings of -1.0ev and +1.0ev respectively. The second photo was underexposed by an exposure value of 1.0ev, which is roughly twice as dark as the normal shot. The third photo was overexposed by the same amount. These three pictures were combined in Photoshop to produce a high resolution 32-bit-per-component image using the HDR merge tool. Photoshop uses the overexposed image to fill in detail for the shadows. The underexposed image is used to fill in detail for the highlights. The generated image captures the dynamic range of exposure throughout the image, but has too much component resolution, and cannot be displayed on screens or printers correctly. To fix this, we have more work to do.