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crazy color im-balances
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May 7, 2016 08:02:58   #
pelha Loc: middlle of nowhere NY
 
i shot an event, raw, nikon d7100, using my somewhat old metz 44 af-1 @1/8 power. the 1st image was in one ballroom, the 2nd in another. i changed nothing other than focus from one room to the next. the attached images are direct export to jpg from my raw files, in lightroom 6, no postprocessing whatsoever. the 1st image i was able to clean up, mostly, except for purple tinges to the sconce lights. the pix from the 2nd room were easy to fix. anyone what any idea what the lighting might be in that 1st room? leds, maybe? and why the intense yellow in the 2nd one? i've shot other events in other venues, using exactly the same camera & flash, without either of these problems.


(Download)


(Download)

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May 7, 2016 08:26:22   #
Mac Loc: Pittsburgh, Philadelphia now Hernando Co. Fl.
 
You might want to consider asking your question in the "Photo Analysis" and/or the "Post Processing" forum sections.

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May 7, 2016 08:30:53   #
pelha Loc: middlle of nowhere NY
 
Mac wrote:
You might want to consider asking your question in the "Photo Analysis" and/or the "Post Processing" forum sections.


realized that after i had clicked send -- my computer memory is dying (although fairly new) and just doing simple actions sometimes takes all my attention (have new chips in hand!) how do i change the section? or do i have to write it over again?

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May 7, 2016 08:31:08   #
f8lee Loc: New Mexico
 
The warm light color in the second shot is likely from standard tungsten or tungsten-halogen lamps in the ceiling. As for the first, fluorescent tubes can give a wide array of colors, including purple, perhaps those are CFLs?

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May 7, 2016 08:32:48   #
Mac Loc: Pittsburgh, Philadelphia now Hernando Co. Fl.
 
pelha wrote:
realized that after i had clicked send -- my computer memory is dying (although fairly new) and just doing simple actions sometimes takes all my attention (have new chips in hand!) how do i change the section? or do i have to write it over again?


You can ask Admin to change it.

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May 7, 2016 11:42:40   #
jdubu Loc: San Jose, CA
 
What was your white balance set as?

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May 7, 2016 12:41:42   #
pelha Loc: middlle of nowhere NY
 
jdubu wrote:
What was your white balance set as?


auto1 normal. shouldn't that setting only affect in camera jpg saves?

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May 7, 2016 13:16:35   #
jdubu Loc: San Jose, CA
 
pelha wrote:
auto1 normal. shouldn't that setting only affect in camera jpg saves?


White balance settings affect your shot regardless of raw or jpeg. It is just easier to change balance in raw, since balance in jpeg is incorporated into the finished result.

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May 7, 2016 13:21:59   #
pelha Loc: middlle of nowhere NY
 
btw, i've shot in tungston & in clf lighting, with the same equipment, and not seen such a strong yellow, nor any of the purple. that's why i'm wondering if the purple might be leds.

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May 7, 2016 13:28:59   #
jdubu Loc: San Jose, CA
 
Auto white balance is affected by what it perceives as neutral coloration of reflected light within the scene. Your examples have obvious differences in the majority of reflected color, the second has a lot of white reflection of your flash. That rendered your ambient lighting to incandescent yellow, as it should due to the color temp difference. The first tried to adjust for perceived neutral throwing your ambient light color accordingly.

When I shoot in events like this, I set the white balance to the ambient lighting and gel the flash to match the ambient color temp as closely as possible, unless I want a different look from subject to the background.

When I shoot in events like this, I set the white balance to the ambient lighting and gel the flash to match the ambient color temp as closely as possible, unless I want a different look from subject to the background.
I never use AWB because the white balance changes from photo to photo based on the scene. If I am in a static environment, I can do a quick custom white balance or a K setting, then change the WB to one of the standards if I move from that area to another differently lit area. Then change back if I return.

To me, much easier than dealing with adjusting color temp differences from flash and assorted ambient lighting in post.

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May 7, 2016 13:36:23   #
jdubu Loc: San Jose, CA
 
dupe post

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May 8, 2016 05:41:30   #
R.G. Loc: Scotland
 
Don't underestimate the effect that reflected light can have on the ambient light. In both shots it looks like much of the light in the room is being bounced off of the walls, resulting in the colour of the walls having a pronounced effect on the colour of the ambient light.

Even in the case of down-lighting, the colour of the floor coverings will have a slight effect on the ambient light. But in these cases it's the walls that are the main influence.

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May 8, 2016 09:13:25   #
pelha Loc: middlle of nowhere NY
 
jdubu wrote:
Auto white balance is affected by what it perceives as neutral coloration of reflected light within the scene. Your examples have obvious differences in the majority of reflected color, the second has a lot of white reflection of your flash. That rendered your ambient lighting to incandescent yellow, as it should due to the color temp difference. The first tried to adjust for perceived neutral throwing your ambient light color accordingly.

When I shoot in events like this, I set the white balance to the ambient lighting and gel the flash to match the ambient color temp as closely as possible, unless I want a different look from subject to the background.

When I shoot in events like this, I set the white balance to the ambient lighting and gel the flash to match the ambient color temp as closely as possible, unless I want a different look from subject to the background.
I never use AWB because the white balance changes from photo to photo based on the scene. If I am in a static environment, I can do a quick custom white balance or a K setting, then change the WB to one of the standards if I move from that area to another differently lit area. Then change back if I return.

To me, much easier than dealing with adjusting color temp differences from flash and assorted ambient lighting in post.
Auto white balance is affected by what it perceive... (show quote)


i was using a gary fong light sphere, flash pointed up to the ceiling. guess i'll have to dig out my ancient gels & see if i can rig them over the flash. but i'm not sure i would have noticed the purple in live view or in playback. i find the screen software presents a version that isn't always close to the saved jpg or what lightroom presents when i load the raw.

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May 8, 2016 09:38:46   #
David Kay Loc: Arlington Heights IL
 
[quote=pelha] the 1st image i was able to clean up, mostly, except for purple tinges to the sconce lights.


The purple fringing appears to be Chromatic aberration, which is caused by the lens or if you have a UV filter on the front of a lens.

Google it and you will get a wealth of information.

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May 8, 2016 09:45:14   #
pelha Loc: middlle of nowhere NY
 
[quote=David Kay]
pelha wrote:
the 1st image i was able to clean up, mostly, except for purple tinges to the sconce lights.


The purple fringing appears to be Chromatic aberration, which is caused by the lens or if you have a UV filter on the front of a lens.

Google it and you will get a wealth of information.

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