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HDR advice

Discussion on topics such as digital photography, scanning, and editing.
Moderators: Royce Howland, Greg Downing, E.J. Peiker

HDR advice

Postby joseph motto on Sat Nov 07, 2009 1:25 pm

I have not attempted the HDR technique previously and do not regularly concentrate on scenic photography. However, a recent trip to Banff, Lake Louise, and Jasper resulted in quite a few scenic images. Due to the extreme range of tones at Lake Louise and Moraine Lake I captured several batches of images with an eye toward using the HDR technique. I do not have separate software for this purpose and attempted to do so using CS3 but could not get the hang of it. Since I will not likely use this very often I was reluctant to invest in HDR software. Can anyone lead me through the CS3 HDR process? Is it good enough to use (I've heard it is not ideal) or should I skip it and do the best I can with individual image processing?
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Postby Royce Howland on Sat Nov 07, 2009 1:59 pm

Joseph, I use HDR heavily and constantly, and wouldn't want to live without it. If you search the image forums for past posts of mine you'll see what kind of stuff I do with it. Having said that, a couple of high level comments:
  • First, IMO, HDR support in Photoshop sucks. I've had that opinion since my first jumbo HDR article published here at NSN years ago, and so far very little has happend in Photoshop to change my mind. Specifically, there are two parts of the HDR process -- merging individual exposures into a single HDR image, followed by tone-mapping the HDR image back down to a single TIFF (or JPEG) for finishing work. The latter is where Photoshop really falls down... its tone mapping capabilities are not that useful or interesting, for a given level of effort.
  • Second, again IMO, to get really good looking HDR results is going to take more effort than simply feeding a bunch of files into some automatic software, and playing with a couple of sliders. I invest a fair amount of effort in my files. It took a lot longer early on because I had to experiment a lot and work around various deficiencies in the tools, as well as figure out where and how best to accomplish certain parts of the process to get the relatively seamless and photo-natural looking results I'm typically after. Now that I know how to do all that stuff, and with the tools having gotten better at handling larger files sizes and such, I'm much more efficient at working through this process. But for folks newly starting out, frankly it's probably going to feel like a pain in the butt. You have to really want that kind of result based on the shooting conditions and your desired resulting images. For anybody who doesn't want to invest that kind of effort in the post-processing area, use filters, go for artistic blown-out effects, or don't shoot in situations with high DR. :)
The majority of what I wrote ages ago in the NSN HDR article is still valid, though the tools have been updated. I have also updated my workflow in a couple of key ways, often described in some of the longer technical / process bits in a few of my image posts. But start with the article; it will lay out the basics.

My HDR processing tool of choice has been and remains Photomatix. There are many more tools now than when I started with HDR, and some of them are getting interesting. But none of the newer ones have supplanted Photomatix as my workhorse. Most software is available on a trial basis so you don't have to shell out money to decide whether you really get a useful result or not.
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Postby Greg Russell on Sat Nov 07, 2009 9:08 pm

Hi, Joseph. Royce's advice is exactly what I would have told you (and said more eloquently, too). I would especially emphasize his second point. Creating a realistic HDR image, or more properly one that is true to what you actually saw takes a considerable amount of effort. To start with, I would suggest this thread:

viewtopic.php?f=2&t=84016

because it describes some of the basic techniques for dealing with the halos you will encounter, almost immediately. My blog has some posts that describe some of these techniques with examples as well.

HDR is something that took me a while to "get the guts" to try, but now that I have, I'll continue to use it as a integral part of my workflow. Its not necessary with every image, but when done properly, it gives you way more latitude than without.
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Postby Royce Howland on Mon Nov 09, 2009 7:39 pm

FYI, I've just put a mini tutorial in my latest Landscapes post:
viewtopic.php?f=4&t=165974
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Postby dbostedo on Mon Nov 09, 2009 8:54 pm

Joseph - As a work around if you find "real" HDR too much challenge or effort...you could try combining 2 or 3 images at different exposure levels and combining them with some masks (sort of like replicating GND results). I think David Clapp's Exposure Blending Tutorial is the clearest one I've seen for this. It can be expanded to use more shots if you wish.

This isn't real HDR, because it doesn't involve the creation of the intermediate image encompassing the whole range possible, then mapping it back down to a "normal" range. But it can give nice results in images that contain more dynamic range than the camera can capture.
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Postby Royce Howland on Mon Nov 09, 2009 9:22 pm

Dave is a master of the traditional PS exposure blend. Though I do take umbrage at his opening editorial comment "more realistic than HDR"... :lol:
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