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DPChallenge Forums >> Tips, Tricks, and Q&A >> Red Hot
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Showing posts 1 - 18 of 18, (reverse)
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 06/16/2007 10:57:32 AM · #1
I don't know if it's just my eyes or if my reds really do seem hot.

F/11 1/20sec ISO 200 (The sharp edges on this hurt my eyes)


F/2.8 1/13sec ISO 100 (This one isn't so bad)


F/6.3 1/200sec ISO 200 (Psychedelic baby!)


Can anyone clue me in to what is happening? My reds seem to bleed and I lose detail. I also get really sharp edges around the reds.

What can help prevent this? What's the science behind what is happening?
 06/16/2007 11:05:59 AM · #2
Shooting jpeg? Turn the in camera saturation down (by about 400 nothces heheh).
 06/16/2007 11:13:05 AM · #3
I think you've noticed the difference between ISO's. I can't imagine that anything above 100 would be necessary to shoot something in open sunlight, and the 200s you've posted are the ones where the reds are blown. I might also try underexposing by a stop.
 06/16/2007 11:13:13 AM · #4
Originally posted by routerguy666:
Shooting jpeg? Turn the in camera saturation down (by about 400 nothces heheh).


Yes, JPEG. I'm hoping there's a way to adjust this without going through 5 layers of menu settings every time I shoot something red or pink, heh.
 06/16/2007 11:15:21 AM · #5
how were they lit?
 06/16/2007 11:17:13 AM · #6
Originally posted by Rebecca:
I think you've noticed the difference between ISO's. I can't imagine that anything above 100 would be necessary to shoot something in open sunlight, and the 200s you've posted are the ones where the reds are blown. I might also try underexposing by a stop.


So the scientific question is are reds more reflective? Or is it the surface that is reflective? Either way requiring me to underexpose.
 06/16/2007 11:17:39 AM · #7
Originally posted by Rebecca:
I might also try underexposing by a stop.


Yeah, looks to me like an exposure issue. The red channel is usually the first channel to pop its top if overexposed.
 06/16/2007 11:18:48 AM · #8
Originally posted by I Enjoy Ham:
how were they lit?


Open sunlight. The two really blown ones were early morning. The middle okay one was late afternoon.
 06/16/2007 11:21:03 AM · #9
Originally posted by aliqui:
Originally posted by I Enjoy Ham:
how were they lit?


Open sunlight. The two really blown ones were early morning. The middle okay one was late afternoon.


Notice that you aren't shooting the middle one from the top either, so not getting as direct sunlight.

I'm sure the D80 has an auto-bracket mode. Try that next time and compare the shots at different exposures.
 06/16/2007 11:22:00 AM · #10
Originally posted by aliqui:
Originally posted by I Enjoy Ham:
how were they lit?


Open sunlight. The two really blown ones were early morning. The middle okay one was late afternoon.


are you sure your metering was right...check out the histograms on both of the shots.
 06/16/2007 11:25:28 AM · #11
Originally posted by I Enjoy Ham:
Originally posted by aliqui:
Originally posted by I Enjoy Ham:
how were they lit?


Open sunlight. The two really blown ones were early morning. The middle okay one was late afternoon.


are you sure your metering was right...check out the histograms on both of the shots.


huh...? =)

Edit: I guess I don't know how to read a histogram. I've never looked at that screen. They're not on my camera anymore either. There's probably software I can download..

Message edited by author 2007-06-16 11:31:48.
 06/16/2007 11:31:48 AM · #12
Originally posted by aliqui:
Originally posted by I Enjoy Ham:
Originally posted by aliqui:
Originally posted by I Enjoy Ham:
how were they lit?


Open sunlight. The two really blown ones were early morning. The middle okay one was late afternoon.


are you sure your metering was right...check out the histograms on both of the shots.


huh...? =)


check this out histogram
06/16/2007 11:44:08 AM · #13
Originally posted by I Enjoy Ham:
check this out histogram


Well I feel smarter.

So what we're all coming up with is that they're all just overexposed? Inorder to get the centers bright enough though, I'm still going to have to overexpose and rely on Photoshop. Like this one I entered into Freestudy after toning down the reds in Hue/Sat:



06/16/2007 11:53:58 AM · #14
Oooo... Histograms in Photoshop...

F/11 1/20sec ISO 200


F/2.8 1/13sec ISO 100


F/6.3 1/200sec ISO 200


edit: in the right order this time..

Message edited by author 2007-06-16 11:55:44.
 06/16/2007 12:01:39 PM · #15


When working on mostly red images you might want to edit with the Gamut warning on. If ya look at the top image you're blowing red completely out of gamut. The bottom is the red channel of the image - way over exposed.
 06/16/2007 12:07:28 PM · #16
Originally posted by fotomann_forever:


When working on mostly red images you might want to edit with the Gamut warning on. If ya look at the top image you're blowing red completely out of gamut. The bottom is the red channel of the image - way over exposed.


Ooo.. another interesting toy.
 06/16/2007 12:49:25 PM · #17
I'm not sure how you can determine it's an exposure issue when the camera has already processed the image you are looking at a histogram of. You can oversaturate the channel and get a histogram which shows that channel as being blown out.

Again I would flat line (or take them negative) your camera's saturation setting and then take some test shots with what you feel is correct exposure. Then look at the histogram and see what it tells you.
 06/16/2007 01:45:17 PM · #18
On the D80 be sure to check your settings under "Optimise Image". You may be setting for Vivid or MoreVivid or your overall saturation may be set too high. You may want to check the Color Mode too, and make sure it is not set to IIIa, although this is recommended for photos which are not edited in software. Mine is always set to II which is AdobeRGB.

A general rule for the D80 seems to be to underexpose by -0.7 EV and this seems to keep the reds in check - but red does blow oh so easily :-)

Hope this helps.
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