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 Post subject: HRD Noise in black sky
PostPosted: Wed Jan 26, 2011 11:39 pm 
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Joined: Sun Apr 18, 2010 12:33 pm
Posts: 443
Location: St. John's, NL, Canada
Hey all,

Lets set the stage: Your taking a hdr, useing 3 or more exposures on a night shot of a city. your longest photo is around 5 seconds. In this photo, and all the rest, the majorty if the sky is black with maybe some light flare at the horizon. That's cool, you like it that way.

A few hours later, you try to spice it up with some HDR magic. Photomatix is the program, you do your usually routine, and what the heck went wrong?? The city comes out nice, but the sky is noisy as hell.. it's not black, it's blotchy red!

I get whats going on, photomatix is trying to brighten it up, to get it somewhere in the middle of the histogram, BUT, it's supposed to be black, it's a night sky. Messing around with all the dials does help, but what helps the blotchy sky, ruins your nice cityscape. I realize this can be corrected in photoshop, but is there another way? Has anyone else encountered this problem, or does EVERYONE encounter this problem and use photoshop to fix it?

Thanking you in advance,
Trevor


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PostPosted: Thu Jan 27, 2011 10:35 am 
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Joined: Sun Feb 15, 2009 12:59 pm
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Location: The Netherlands
For the record, a night sky isn't black: :wink:

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I take pictures so quickly, my highschool was "Continuous High".


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PostPosted: Thu Jan 27, 2011 11:42 pm 
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Location: St. John's, NL, Canada
ok, fine... if the shutter speed is fast enough, it's dark.


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PostPosted: Fri Jan 28, 2011 12:10 am 
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And there might be your problem, maybe your shutter speed wasn't high enough for complete black, but Photomatix can retrieve data from the file and spits it out (noisy result).

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