In my previous column, I went over the basic controls of Adobe Photoshop CS5
’s “High Dynamic Range (HDR) Toning.” Now, it’s time to fine-tune.
To fully understand HDR, it helps to know why it was invented. As digital imaging evolved, it became easy to capture information beyond what a single frame can depict. When Photoshop
creates a huge 32-bit image — by combining data from the deepest shadows to the brightest highlights — a problem arises. How do you bring all these tonal values down to a more limiting 16- or 8-bit image without losing too much detail?Astronomy magazine subscribers can read the full column for free. Just make sure you're registered with the website.