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General photography questions and answers: Discuss Sharpness....Dont know if its just me but there seems to be a loss in sharpness when you use hdr programs ...
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Old 01-11-2009, 21:58   #1 (permalink)
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Sharpness.

Dont know if its just me but there seems to be a loss in sharpness when you use hdr programs for tone mapping, would this be right & is there another way around this,?when i merge 3 images together my results seem to be a lot sharper believe it or not
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Old 02-11-2009, 07:09   #2 (permalink)
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Re: Sharpness.

Tone mapping compresses the contrast, effectively reducing it so there'd be a perceived loss of detail, especially when sizing down
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Old 02-11-2009, 13:15   #3 (permalink)
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Re: Sharpness.

Gotcha, cheers Mark.
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Old 02-11-2009, 19:06   #4 (permalink)
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Re: Sharpness.

There should not be a loss of sharpness. Firstly, what software are you using?

If you use Photoshop only then it only has global tone mapping and you will need post process and increase mid tone contrast (stay in 16 bit for this). If you are using Photomatix, this should not be a problem as Photomatix has local enhancement and you should be able to produce good mid tone contrast without further processing.

The other area to consider is whether you images are aligned accurately. If you take the three exposures in auto-bracketing on a tripod, there should be no problem. However, if you hand hold even at high exposure speeds and movement in the scene or by the photographer can be a problem. However, photomatix can automatically align the images if you tick the right boxes and the movement is only slight. I find that the best results are always using a tripod whether I use Photomatix or combine the images myself; it just takes me about 100 times longer than Photomatix.
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Old 02-11-2009, 20:44   #5 (permalink)
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Re: Sharpness.

Photoshop has a script or a diolog box in automate or scripts, sorry can't remember which one. That will align images in a layers stack,,,works real good. I know because I have been using it alot lately. Has nothing to do with sharpness other then what you with the stack.
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Old 04-11-2009, 10:04   #6 (permalink)
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Re: Sharpness.

Simpbow, I know this sounds very obvious, but when you take your various exposures you're not altering the aperture are you?
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Old 04-11-2009, 13:37   #7 (permalink)
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Re: Sharpness.

Cheers guys no exposure is kept the same, use a tripod for all me shots because of my balance, 1 to many, been using photomatix on the images , have tried ticking some boxes but think i might have the wrong settings by what ive heard here, at the minute i have changed it to align source images- by correcting horz & vert shifts,
Attempt to reduce ghosting- background movements,
Detection normal, it has seemed to of made a difference now, but am i missing something that i should or should not of ticked,its not bad either Boofers.
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Old 05-11-2009, 16:54   #8 (permalink)
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Re: Sharpness.

I have noticed this on some autumn tree shots with 5 combined images. I think that in my case it is the leaf movement that causes the problem, but this wouldn't appy to solid structures of course.
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Old 06-11-2009, 21:19   #9 (permalink)
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Re: Sharpness.

Think ive got it sorted now, matter of wrong button being ticked.
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