Sunday 30 June 2013
Friday 21 June 2013
Indian Pond Heron
Monday 10 June 2013
Own Kingdom...
Wednesday 5 June 2013
HDR (High-dynamic-range)
High-dynamic-range imaging (HDRI or HDR)
HDR is a set of methods used in imaging and photography to capture a greater dynamic range between the lightest and darkest areas of an image than current standard digital imaging methods or photographic methods. HDR images can represent more accurately the range of intensity levels found in real scenes, from direct sunlight to faint starlight, and is often captured by way of a plurality of differently exposed pictures of the same subject matter.HDR methods provide higher dynamic range from the imaging process. Non-HDR cameras take pictures at one exposure level with a limited contrast range. This results in the loss of detail in bright or dark areas of a picture, depending on whether the camera had a low or high exposure setting. HDR compensates for this loss of detail by taking multiple pictures at different exposure levels and intelligently stitching them together to produce a picture that is representative in both dark and bright areas.
CAPTURING HDR PHOTOGRAPHY
In HDR photography we capture multiple different, but overlapping, exposures to cover the DR of the scene. In general the exposures differ by 1-2 EV. This means the total number of needed exposures is defined by:- The DR of the scene we want to capture
- DR the camera can capture in a single shot
Each additional exposure can add 1-2 EV (depending on your selected bracketing) of DR to the camera's DR.
Now we have to find out what we can do with these multiple exposures. There are quite a few methods:
Manual blending (today in Photoshop, was/is done with enlargers)
Automatic Exposure Blending (Fusion)
Creating HDR images (in HDR enabled Software)
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