Author Topic: HDR imaging (Read 5732 times)

ichiro17 · « **on:** July 10, 2007, 08:37 »

I've been experimenting with HDR because I've been shooting some drapery on windows with huge dynamic range as well as night shots with fairly large dynamic range. I find that it works okay, but sometimes I get these lines (like CA, but not quite) that follow where the dark meets the light. I was using the 17-40L so lens quality isn't a problem.

Is this issue easily fixed? Am I doing something incorrect? I can't post any just yet because I'm not at home, so I hope someone know what I'm talking about.

Thanks in advance. I've learned a lot of photoshop over the past 14 months, and I don't want to stop learning. Its really fun to create/fix.

Joseph

pr2is · « **Reply #1 on:** July 10, 2007, 09:59 »

There is so much involved in HDR, it's impossible to answer in a framework of a post or two. Basically, there are two main ways to create it, manually, or using specialized software. Manual HDR involves layers and masks from multiple images (or multiple exposures taken from single RAW file), it was described in great details recently by one of dpreview posters, http://forums.dpreview.com/forums/read.asp?forum=1022&message=23564289. With software-created HDR you usually are going to have to work with it manually anyway to make it more or less believeable. These two links describe it well as far as CS is concerned:

http://www.cambridgeincolour.com/tutorials/high-dynamic-range.htm
http://www.naturescapes.net/072006/rh0706_1.htm

And then, there is whole Photomatix world where images have quite surreal look which some aim for but most hate

Second link out of those two above shows some of it too.

Depending on which way you use, you may have different reasons for what you descibe. Hope those links help you locate it.

This one was done using CS3+manual tuning up. Not the best of my images I guess, but it was quite inetresting to overcome technical challenges of this lighting:

chellyar · « **Reply #2 on:** July 10, 2007, 15:36 »

I've done a bit of playing around with HDR as well, the cliche stuff, church interiors, sunsets... Uinsg photomatix pro and manually using layers.

Sometimes you get those lines in photomatix, using the 'enhance detail' mapping option. Doing it manually It's never a problem, as I'm masking up to the edge of the details I want.

Typically I'm just using three raw exposures spread two stops so I'm getting +- 4 stops from the 'auto' exposure. I have done a couple teathered, were I went 10 exposures in raw, 1 stop apart. It looked too surreal for my liking, but was interesting to play with.

Using layers I'll create up to 6 layers from the three raw imagses, and the mask manually the bits I want using Gaussian blurred layer masks, and then tweak with a fine airbrush if I want.

What method are you using?

ichiro17 · « **Reply #3 on:** July 11, 2007, 08:22 »

I was/am using CS2's HDR thingy. Seems okay. I tried photomerge and did not like it too much. I guess I'd prefer to do it manually but really not willing to take too much of the time unless its a print of some sort and not a stock photo.

Joseph

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Author Topic: HDR imaging (Read 5732 times)

ichiro17

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ichiro17

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