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DPChallenge Forums >> Tips, Tricks, and Q&A >> Great tutorial on dynamic range and HDR
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07/23/2007 02:53:18 PM · #1
Enjoy!
//www.trustedreviews.com/digital-cameras/review/2007/07/15/Photography-Tutorial-Dynamic-Range-and-how-to-fake-it/p1
09/16/2007 06:31:56 AM · #2
Hijacking this thread. Has anyone done a tutorial about how to do HDR on CS3? I've tried but with no success. What I have been trying to do is to get three photos that I have manually changed the levels on (due to the fact that I dont know how to do bracketed exposures yet), then I have tried merging them in HDR. I just end up with a washed out looking photo.

If there is no tutorial woulod someone like to do one or to make a small step by step procedure in this thread. Ta
09/16/2007 09:44:17 AM · #3
braketing exposures is easy. you don't need to use the cameras auto braket setting if that's what you can't figure out.

set the camera to manual exposure. dial in the exposure so it's right in the middle of the little exposure graph - shoot 1st shot. adjust exposure one stop up via the shutter speed and shoot 2nd shot. dial in one stop below the 1st shot via shutter and shoot the third. you'll need to use a tripod and have a subject that isn't going to move.

this will give you one properly exposed shot, one over exposed shot, and one under exposed shot.

you adjust the exposure using the shutter speed so the depth of field doesn't change from frame to frame.

you can adjust where you bracket from too. the base line image doesn't need to be right in the middle of the exposure graph if that gets you a better exposed starting point. just adjust one stop up and one stop down from your base line exposure.

the cameras auto exposure braketing will be a faster means to get the images as you don't need to manually change the exposure settings - the camera does it for you based on how far under and over exposed you set it too. you just need to press the shutter three times in a row. ( at least on the 10d )

Message edited by author 2007-09-16 09:47:41.
09/16/2007 10:07:44 AM · #4
Originally posted by Monique64:

Hijacking this thread. Has anyone done a tutorial about how to do HDR on CS3? I've tried but with no success. What I have been trying to do is to get three photos that I have manually changed the levels on (due to the fact that I dont know how to do bracketed exposures yet), then I have tried merging them in HDR. I just end up with a washed out looking photo.

If there is no tutorial woulod someone like to do one or to make a small step by step procedure in this thread. Ta


The only way to go for HDR is bracketing exposures so I suggest you practice that first. Keep in mind that you should "bracket in the right direction". If the scene has primarily dark details you should bracket more to overexpose. If the scene has more highlight detail, bracket to underexpose. If the scene has both, bracket both ways.

A real 32-bit HDR will always look washed out. That's because our computers and screens can only reproduce 8-bit images.

So after you've merged your bracketed raw files into a 32-bit HDR using CS3, you will need to "compress" the information contained in the image back to an image that can be displayed. This is typically referred to as "tone mapping" and can be accomplished with commercially available software such as Photomatix Pro (which also has a tone mapping plugin).
It's the tone mapping that gives the image that 'HDR-look'.

In CS3 you can also change the image mode from 32-bit to 8-bit which will give you a dialog allowing control over the tone-mapping process.

Hope this helps.

Tom.


09/16/2007 04:39:41 PM · #5
Thanks, this has been helpful. Will have a play later.

Message edited by author 2007-09-16 16:39:50.
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