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General photography questions and answers: Discuss HDR + Raw?...Hi, most HDR photography tutorials talk about using 3 photos of different exposure...but can you use one raw image which ...
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Old 28-03-2007, 11:48   #1 (permalink)
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HDR + Raw?

Hi, most HDR photography tutorials talk about using 3 photos of different exposure...but can you use one raw image which u change the exposure of in post processing 3 times and then put those 3 exposures into cs2 or photomatix hdr tool?

thanks
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Old 28-03-2007, 11:57   #2 (permalink)
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Re: HDR + Raw?

The short answer is yes. This image is made up from two 'exposures'.



Plus a few other bits and pieces.
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Old 28-03-2007, 14:34   #3 (permalink)
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Question Re: HDR + Raw?

ok thanks, so creating 3 'bracketed' exposures using raw has just as good an effect as using 3 exposures taken using the camera?
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Old 28-03-2007, 14:47   #4 (permalink)
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Re: HDR + Raw?

It depends on the software you use when combining the photo's. Photoshop CS2 won't do two. But when you load 3 it shows them seperate and you can check two off and use them. Make sense? I have limited experience because it takes time now, but continues to get alittle better with updates and independent devolpers. Use three bracketed photo's and practice,,then practice some more. I have a mac and just found a free merge program called DRImaker for mac. It merges them different then CS2 and Photomatrix. You can use what ever format you want.

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Old 28-03-2007, 15:09   #5 (permalink)
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Re: HDR + Raw?

Quote:
Originally Posted by xanda View Post
so creating 3 'bracketed' exposures using raw has just as good an effect as using 3 exposures taken using the camera?
If you mean using 3 'pushed' images from one exposure vs 3 bracketted exposure seperate images, then the answer is that the 3 seperate exposures will be much better.

The true increased dynamic range will be much greater than the pseudo increased latitude.

Having said that, it's often the case that you don't actually need the full range offered by seperate shots
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Old 28-03-2007, 23:17   #6 (permalink)
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Re: HDR + Raw?

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Originally Posted by Markulous View Post
If you mean using 3 'pushed' images from one exposure vs 3 bracketted exposure seperate images, then the answer is that the 3 seperate exposures will be much better.

The true increased dynamic range will be much greater than the pseudo increased latitude.

Having said that, it's often the case that you don't actually need the full range offered by seperate shots
ok thanks...i think that is what i wanted to know, it's just u can't really make a hdr photo of a moving object unless the burst bracketing on your camera was flippin fast and so i wondered if using raw to produce 3 'exposures' instead would suffice.
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Old 29-03-2007, 00:56   #7 (permalink)
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Re: HDR + Raw?

You can only put one RAW file thru' Photomatix at a time. It's better to do proper bracketing shooting in jpg, to render a proper HDR in Photomatix. I'm sure someone will correct me if I'm wrong, as I've only just started playing in Photomatix, but that's what I gather anyway.
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Old 29-03-2007, 06:52   #8 (permalink)
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Re: HDR + Raw?

Don't know Photomatix but surprised it won't take 3 x RAW (or TIFFs) seeing as HDR is all about increased dynamic resolution and with JPGs being 8 bit (versus 12/16 bit) you're losing all that extra data

Have seen an HDR shot which combined 3 x RAW and allowed for movement without blurring - was a beta version of S/W but this is what I'd expect any half decent application to be able to process correctly (like with panos and getting seamless joins!)

I'm sure that HDR applications will get passed the gimmick and 'effects' stage and produce images with better lighting - which is natural looking as well!
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Old 29-03-2007, 07:14   #9 (permalink)
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Re: HDR + Raw?

As Charlotte says you can put a single RAW file through Photomatix (version 2.3.1) to generate an HDR image.......still having to tone map.

It's still recommended that to achieve the best results is to use three bracketed shots but if you are doing a moving subject then the alternative would be a single RAW.

Quote:
Originally Posted by Markulous View Post
I'm sure that HDR applications will get passed the gimmick and 'effects' stage and produce images with better lighting - which is natural looking as well!
In Photmatix you can achieve a more natural exposed look by playing with the new 'Micro Smoothing' option.
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Old 29-03-2007, 12:02   #10 (permalink)
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Re: HDR + Raw?

Using a single Raw file you can handle about 11 to 12 stops dynamic range. Using this optimised tonally by selective adjustments or combining 3 different "exposures" from the RAW file, this would be similar to producing an HDR from 3 JPEGs exposed +/- 2 stops. However, if you want to handle an even larger dynamic range then multiple exposure of RAw or even more exposures of JPEG; the full version of Photpmatix can handle many exposures. Raw would mean less exposures than JPEG. Although I do not think Photomatix will directly read RAW file, it will read the converted 16 bit files, I believe.

As pointed out this is not much use for moving objects.
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