What's the problem here with the yellow gradient?

dleone · 17th of December 2008 (Wed)

Hi all,
Been taking some pictures today at the daycare of my little one and after loading the pictures into Aperture I noticed that many of the pictures show a yellow gradient. It totally varies from none to useless and it's particularly obvious in stack I got from continuous shooting. It's quite frustrating - about 50% of all the pictures I have taken are useless like that, there are a few that don't show any gradients.

I've used two different lenses at the event (35L and 85/1.8), so it's not a problem with a lens (or the filter in front of the lens). I've used a 5D for these shots.
Notice how the background (snowmen at the wall) in one pair of pictures varies and the foreground (marshmellows) varies opposingly.
The fact that it's gradients indicates to me that it's not simply white balance that's off.
Does anybody have any suggestions?
Many thanks in advance

dleone · 17th of December 2008 (Wed)

here's two more examples.

Deckham · 17th of December 2008 (Wed)

Strange.
Looking at your last two, settings are identical. So i can only assume that the camera has used a different point to calculate (auto) wb.

WilliamL · 17th of December 2008 (Wed)

could it possibly be a problem with your flash? with the little boy picture.. maybe the flash had a full charge for the first picture and only a partial charge for the second shot..

i may be way off base here .....

Deckham · 17th of December 2008 (Wed)

Quote:

Originally Posted by WilliamL

could it possibly be a problem with your flash? with the little boy picture.. maybe the flash had a full charge for the first picture and only a partial charge for the second shot..

i may be way off base here .....

No flash is registered in exif.

FREEZE · 17th of December 2008 (Wed)

how about florescent lighting would that cause this?

Scott_Quier · 17th of December 2008 (Wed)

This is taken under florescent lighting and your shutter speed not being set to a correct value. For best results your shutter speed needs to be a close multiple of the power frequencey. In the USA, this is nominally 60Hz so your shutter speed needs to be one of 1/125, 1/60, 1/30, 1/15.

Jon · 17th of December 2008 (Wed)

Except that I wouldn't go as fast as 1/125 sec., that's correct. Your shutter needs to be at a speed that'll catch one full cycle of the lamp from peak to peak. If you're at a shutter speed faster than the flash sync, you'll see banding, since the entire frame isn't exposed at one time. If you're between the sync speed and the lamp's cycle rate, you may get "funny" exposures since the instantaneous light level isn't what the meter (which gets an average) saw.

dleone · 17th of December 2008 (Wed)

you guys are great!!!!
So that's why I see more of the banding in the pictures I took with high ISO (even shorter exposures). Essentially, I should be shooting in manual mode, right? Keeping both aperture and exposure time constant at 1/60.
I'll have to try this out again.

Thanks so much for the tips. What an eye-opener!
Dino

Deckham · 17th of December 2008 (Wed)

smacks head
Thanks for the info, guys.

heymirth · 9th of August 2010 (Mon)

I'm so glad they keep this stuff on line forever
This just happened to me this weekend,,, any other thing I can read o this?

17th of December 2008 (Wed)	#3
Deckham Member Join Date: Jun 2007 Location: Melbourne, Australia Posts: 814 IMAGE EDITING OK	Re: What's the problem here with the yellow gradient? Strange. Looking at your last two, settings are identical. So i can only assume that the camera has used a different point to calculate (auto) wb. __________________ Lulu Clake Zenfolio

17th of December 2008 (Wed)	#4
WilliamL Senior Member Join Date: Jul 2006 Location: Mississippi Gulf Coast Posts: 1,195 IMAGE EDITING OK	Re: What's the problem here with the yellow gradient? could it possibly be a problem with your flash? with the little boy picture.. maybe the flash had a full charge for the first picture and only a partial charge for the second shot.. i may be way off base here ..... __________________ 7D * 40D/w 24-70 L * 20D17-85 mmCanon 100-400L IS Canon 70-300mm580EX Anyone who has never made a mistake has never tried anything new. Albert Einstein http://william1956.smugmug.com/

17th of December 2008 (Wed)	#6
FREEZE Member Join Date: Mar 2006 Location: Manitoba Canada Posts: 607	Re: What's the problem here with the yellow gradient? how about florescent lighting would that cause this? __________________ Freeze

17th of December 2008 (Wed)	#7
Scott_Quier Member Join Date: Jul 2006 Location: Newport News, VA Posts: 888 IMAGE EDITING OK	Re: What's the problem here with the yellow gradient? This is taken under florescent lighting and your shutter speed not being set to a correct value. For best results your shutter speed needs to be a close multiple of the power frequencey. In the USA, this is nominally 60Hz so your shutter speed needs to be one of 1/125, 1/60, 1/30, 1/15. __________________ Scott Operation: Love Reunited Check out my blog Gear List

17th of December 2008 (Wed)	#8
Jon Moderator Cocker Spaniel Mod Join Date: Jun 2004 Location: Bethesda, MD USA Posts: 65,316	Re: What's the problem here with the yellow gradient? Except that I wouldn't go as fast as 1/125 sec., that's correct. Your shutter needs to be at a speed that'll catch one full cycle of the lamp from peak to peak. If you're at a shutter speed faster than the flash sync, you'll see banding, since the entire frame isn't exposed at one time. If you're between the sync speed and the lamp's cycle rate, you may get "funny" exposures since the instantaneous light level isn't what the meter (which gets an average) saw. __________________ Jon ---------- EOS, Powershot and Domke - it doesn't get any better than this! T90 and stuff \| F-1n, New F-1, FTb and more stuff out on loan Cocker Spaniels Maryland and Virginia activities *DC Cherry Blossoms* Image Posting Rules and Image Posting FAQ Report SPAM, Don't Answer It! (link) PERSONAL MESSAGING REGARDING SELLING OR BUYING ITEMS WITH MEMBERS WHO HAVE NO POSTS IN FORUMS AND/OR WHO YOU DO NOT KNOW FROM FORUMS IS HEREBY DECLARED STRICTLY STUPID AND YOU WILL GET BURNED.

17th of December 2008 (Wed)	#9
dleone Member Join Date: Feb 2008 Location: SF Bay Area Posts: 40	Re: What's the problem here with the yellow gradient? you guys are great!!!! So that's why I see more of the banding in the pictures I took with high ISO (even shorter exposures). Essentially, I should be shooting in manual mode, right? Keeping both aperture and exposure time constant at 1/60. I'll have to try this out again. Thanks so much for the tips. What an eye-opener! Dino

9th of August 2010 (Mon)	#11
heymirth Member Join Date: Oct 2007 Location: Michigan Posts: 238 IMAGE EDITING OK	Re: What's the problem here with the yellow gradient? I'm so glad they keep this stuff on line forever This just happened to me this weekend,,, any other thing I can read o this? __________________ Canon 5D Classic, Canon 30D, 70-200L F2.8 IS, 50 f1.4; 28-135 f3.5-5.6; 85mm 1.8; 35mm F2.0, 580EX; 430EX, Assorted Strobist Gear; Novatron 240 Kit; Cybersyncs http://christophermarxphotography.com/ http://christophermarxphotography.blogspot.com/

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