HDR or not HDR ?  

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fma38
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HDR or not HDR ?

by fma38 » Fri May 05, 2006 4:37 pm

Hello,

I often read in forums people making HDR with only one RAW picture. They 'develop' from this RAW a first picture with 0EV correction, a second with +2EV and a third with -2EV. Then, they make HDR from this 3 pictures.

For me, with that solution, they only use the 12bits of the RAW picture for the HDR, nothing more. It is not really HDR, as it does not exeed the sensor limits.

Am I wrong?
Frédéric

Canon 20D + 17-40/f4 L USM + 70-200/f4 L USM + 50/f1.4 USM
Merlin/Orion panohead + Papywizard on Nokia N800 and HP TC-1100

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AlexandreJ
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by AlexandreJ » Fri May 05, 2006 4:44 pm

Your are not wrong. This is a false way to get a HDR from a single picture. But in no way you are going to get the same dynamic range as if were done from two or 3 separates raw shots.

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fma38
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by fma38 » Tue May 09, 2006 2:53 pm

Ok, thanks.
Frédéric

Canon 20D + 17-40/f4 L USM + 70-200/f4 L USM + 50/f1.4 USM
Merlin/Orion panohead + Papywizard on Nokia N800 and HP TC-1100

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P'tit Ben
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by P'tit Ben » Mon May 15, 2006 9:00 am

However, it is an excellent method sometime to balance your images through "exposure blending". I've made this for some images and it works fine, as RAW format has more color information than the same image in JPG. It is simple to extract a "dark" and a "light" image if your RAW image has a large lighting range.

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fma38
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by fma38 » Wed May 17, 2006 6:30 pm

Yes, as I said, you use all the information from the 12bits of the RAW file.
Frédéric

Canon 20D + 17-40/f4 L USM + 70-200/f4 L USM + 50/f1.4 USM
Merlin/Orion panohead + Papywizard on Nokia N800 and HP TC-1100


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