Posts Tagged 'HDR'

Nikon D40x and HDR

Too bad, the Nikon D40x does not support auto exposure bracketing (AEB), so how can we create HDR images given this limitation? Here is how I usually do it:

HDR

  1. Place your cam on a tripod and ensure that it ain’t shaky, otherwise you won’t get any good results.
  2. Check your cam’s settings to ensure that the image format is set to NEF (RAW).
  3. Select the “Auto” mode to see what aperture the camera suggests.
  4. Select the “Aperture” (A) mode and set the suitable aperture value with the scroll wheel. We need to do this to ensure the aperture stays the same on all three shots.
  5. Set the exposure value for the first shot, e.g. -2EV. Do this using the scroll wheel while pressing the “+-” button next to the on/off switch.
  6. Now take the photograph, I always use a remote control for this instead of the fire button to avoid shaking the camera. So I only touch the camera to switch the exposure values. You can fire it manually of course, though it’s risky because the result sucks hard if one of the images is shifted.
  7. Carefully switch to the next exposure value and repeat step 6 for all images.
  8. Take a quick glance at the result. Comapare the few pixels in the corner of each shot to ensure that none of them is shifted. Also compare the brightness, if the contrast between the shots is waay to high (totally white/black) you might rather try +-1EV, or vice versa +-3EV if there ain’t enough difference.
  9. On the computer, post-process the images with your favourite image editor. I use Photomatix and Photoshop for the job. In Photomatix, go to HDR->Generate HDR, then select the three image files. Press OK two times to start processing.
  10. Now you get the plain HDR result, you’ll need to apply tone mapping to reduce the color range to suitable values for common display devices, do this using HDR->tone mapping. A new windows opens, toy with all the switches until the image looks somehow good. Save the result.
  11. In Photoshop I usually further enhance the result. Mostly to modify brightness and contrast. Sometimes some colors are too heavily present in the image, this is easy to correct, see the example at the right.
  12. Done 🙂

Castle Munot got HDR’ed

I did some more HDR shots today, it’s fascinating, almost addicting! Here one shot im quite proud of:

Castle Munot HDR

It’s a combination of 3 shots at +-2EV. Luckily nobody passed that way while I shot the +2EV one, it took full 30 seconds 😉 See more of this session at flickr..

HDR and tone mapping

Wow.. I just did my first steps at making HDR and tone mapped photographs. See the first result:

Balcony

I took 3 images of the same scene using different exposure values: 0EV, -2EV and +2EV. On the PC I used the tool Photomatix to combine these and create an HDR image. Tone mapping was then required to shrink the color range, because normal monitors can’t display the full spectrum. It’s really fun to experiment with these technologies, I hope I get a chance to capture some good shots this weekend.