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02/20/2007 05:32:40 PM · #1 |
Sorry if i'm being an absolute plank here but what is HDR? I've had a look through the site and can't seem to find an explanation, but then when you don't really know what your looking for in the first place it is a bit hard!
If someone could explain or point me in the right direction i would greatly appreciate it. Cheers
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02/20/2007 05:33:59 PM · #2 |
//www.hdrinc.com/3/default.aspx
;-) |
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02/20/2007 05:34:49 PM · #3 |
| On a serious note, a simple search of the forums using "HDR" will generate several hits and answer your question. |
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02/20/2007 05:40:52 PM · #4 |
Originally posted by mase:
Sorry if i'm being an absolute plank here but what is HDR? I've had a look through the site and can't seem to find an explanation, but then when you don't really know what your looking for in the first place it is a bit hard!
If someone could explain or point me in the right direction i would greatly appreciate it. Cheers |
It stand for High Dynamic Range. Every light sensitive medium (film, sensor, even your eye) can see a certain range range of light from extreme bright to extreme black. This is usually expressed in EV range. Digital Sensors are akin to old slide film in which can only see 6-8 EVs at a time (thereabouts) while traditional 35mm film can see alot more.
HDR in photoshop speak, is the combining of the multiple images either taken at different exposures or the same image processed into different exposures. In theory you only need two of the same image to create an HDR image, but the more you have the better (some people do 7 or 9).
Doing this allows you not "perserve the blacks" and not "blow out the highlights". Done properly the image looks stunning, poorly combined HDR looks very artificial, especially in the midtones. |
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02/20/2007 06:24:33 PM · #5 |
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02/20/2007 06:47:35 PM · #6 |
Originally posted by jaysonmc:
Originally posted by mase:
Sorry if i'm being an absolute plank here but what is HDR? I've had a look through the site and can't seem to find an explanation, but then when you don't really know what your looking for in the first place it is a bit hard!
If someone could explain or point me in the right direction i would greatly appreciate it. Cheers |
It stand for High Dynamic Range. Every light sensitive medium (film, sensor, even your eye) can see a certain range range of light from extreme bright to extreme black. This is usually expressed in EV range. Digital Sensors are akin to old slide film in which can only see 6-8 EVs at a time (thereabouts) while traditional 35mm film can see alot more.
HDR in photoshop speak, is the combining of the multiple images either taken at different exposures or the same image processed into different exposures. In theory you only need two of the same image to create an HDR image, but the more you have the better (some people do 7 or 9).
Doing this allows you not "perserve the blacks" and not "blow out the highlights". Done properly the image looks stunning, poorly combined HDR looks very artificial, especially in the midtones. |
along with that, if your image doesn't contain a large range between light and dark then you really aren't doing anything by using HDR. There have been a few samples lately where the original just needed some curves altered and they looked great while others benefit greatly from HDR and tone mapping.
If you still need help after reading L2's link, seek out  bear_music, he is quickly becoming an expert and is always willing to help in all aspects of photography. |
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02/21/2007 01:09:45 PM · #7 |
Thanks everyone, well explained. Now i understand, hurrah.
Cheers
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02/21/2007 01:58:53 PM · #8 |
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