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Help Please on solving a blue cast on photos.
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Feb 8, 2016 13:39:05   #
The Villages Loc: The Villages, Florida
 
Bill_de wrote:
Color temperature is not camera dependent.

When you set the color temp to 10,000 you are telling the camera that the ambient light is very very blue. Your camera believes you. In trying to correct for the blue light, it is turning your image red.

--


Guess I'm just looking at the end result...what I see when I check the LCD screen. At 10,0000 its too redish, at 2,500 way to blue.

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Feb 8, 2016 13:45:25   #
jdubu Loc: San Jose, CA
 
PCity wrote:
Guess I'm just looking at the end result...what I see when I check the LCD screen. At 10,0000 its too redish, at 2,500 way to blue.


Photographers can use that temperature adjustment knowingly to manipulate the look of a photo. Sometimes in conjunction with flash lighting and gels to change the whole feel of the shot.

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Feb 8, 2016 13:49:01   #
GoofyNewfie Loc: Kansas City
 
Haveago wrote:
.... I adjusted the cameras white balance for strip lghting but all the photos have come out with a Blue cast. ......
Baz


Fluorescent lighting comes in a lot of shades.
On the second floor of our building, the fluorescent lighting is pretty close to tungsten balance.

Best thing to do is a custom white balance if you are shooting jpeg (and even if you shoot raw, it gets you really close right off the bat)

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Feb 8, 2016 14:02:26   #
CHOLLY Loc: THE FLORIDA PANHANDLE!
 
Haveago wrote:
Hi all, I have a question regards these photos. They were taken handheld inside a large building with tube lighting, people playing bowls. I adjusted the cameras white balance for strip lghting but all the photos have come out with a Blue cast. All the photos are JPEG, next time I'll do RAW aswell.

Anyone out there have suggestions for:
1. Any in camera adjustment I can do so it don't happen again?
2. Is there a way I can adjust the photos in camera BEFORE I format the card.
3. How to get rid of the blue cast using Photoshop, Lightroom, GIMP or Picasa?
Many thanks for any guidance.

Baz
Hi all, I have a question regards these photos. T... (show quote)



As others have mentioned, the problem is with the white balance of your images.

Let me add to the suggestion that you shoot custom white balance prior to taking the images you wish to record. Buy a custom white balance card. It will be gray, and following your camera manuals instructions for setting a custom white balance for the given lighting of a particular scene will only take a few seconds.

This is critical when you shoot JPEGs because that image format offers much less latitude in post processing than the RAW format does.

Try it... your results will be more in line with what your eyes actually saw.

GOOD LUCK!

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Feb 8, 2016 14:11:25   #
TriX Loc: Raleigh, NC
 
PCity wrote:
Don't know about your camera, but on my D300 2,500 K is blue, blue, and 10,000 K is red/orange


Not sure what your camera says, but the color temperature in K is not camera specific, it's the color temperature of the light. Please see http://en.m.wikipedia.org/wiki/Color_temperature

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Feb 8, 2016 14:22:54   #
DirtFarmer Loc: Escaped from the NYC area, back to MA
 
Allow me to point out that not all light sources can be characterized by a color temperature. "Color Temperature" is what the light would look like if you were illuminating it by a black body heated to that temperature. That's the case for incandescent lighting (not really a black body, but it's a good approximation), but other light sources, including LED and Fluorescent lighting can vary from that ideal. Sometimes significantly. In particular, if you have mixed sources, the result may not be easy to handle. (Think about Sodium street lights -- they're primarily yellow {for the low pressure lamps anyway}).

Lightroom's Develop panel has a white balance section. THere are two parts to it: Temperature and Tint. Since you're dealing with a camera which uses a 3-color process, you need at least two parameters to balance the image you get to make something a neutral gray, i.e. a white surface with the red, green, and blue elements of equal intensity.

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Feb 8, 2016 14:26:51   #
Bill_de Loc: US
 
Haveago wrote:

Anyone out there have suggestions for:
3. How to get rid of the blue cast using Photoshop, Lightroom, GIMP or Picasa?
Many thanks for any guidance.

Baz


In PhotoShop go to Image/Adjustments/Hue&Saturation.
Desaturate the blue (maybe also cyan) channel as a starter.
Adjust the other channels if necessary to get skin tones corrected.

I did a little fooling around with it without knowing actual colors. It looked pretty good in about 2 minutes.

--

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Feb 8, 2016 14:31:56   #
Bare Loc: SoCal
 
Thee are filters out there that you shoot through to get an accurate white balance setting. The best one is probably Expodisc 2. You can screw it on, or just hold it in front of your lens, point it at your light source, then use that image to set your custom white balance to. It does an amazing job of getting the white balance right. You will be amazed at the difference in your pictures vs the AWB setting.

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Feb 8, 2016 14:43:18   #
LoneRangeFinder Loc: Left field
 
Bill_de wrote:
Color temperature is not camera dependent.

When you set the color temp to 10,000 you are telling the camera that the ambient light is very very blue. Your camera believes you. In trying to correct for the blue light, it is turning your image red.

Color temperature is measured by a unit called the Kelvin (K). The Kelvin thermodynamic temperature scale is defined so that absolute zero is 0 kelvins (K). (Note: The Celsius and Fahrenheit scales are defined so that absolute zero is &#8722;273.15 °C or &#8722;459.67 °F). Imagine heating a bar of steel and observing the color of the bar at increasing temperatures. At some point the bar will appear to glow a dull red. As heat is added, the dull red turns to yellow, then to white, then to bluish white, finally to blue.

--
Color temperature is not camera dependent. br br ... (show quote)


Above response is correct>

http://www.cinelight.com/kelvin-scale-cri-level/

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Feb 8, 2016 15:51:33   #
amfoto1 Loc: San Jose, Calif. USA
 
You adjusted "for strip lighting", but apparently chose the wrong setting. It might be possible with some work to improve on those images, but as others have mentioned it's not easy with JPEGs... RAW files have a lot more latitude for adjustment in post-processing.

To prevent this in the future, set a custom white balance...

Most cameras allow you to do this. You need some form of "target", which you then photograph under the lighting conditions where you'll be shooting. Then you "tell" the camera to use that sample image for reference and set a white balance based on it.

A common type of target that can be used is a Kodak 18% Gray Card, which has a neutral gray side and a totally white side. Either side can be used to set a custom white balance, but the gray side also can be used to set a pretty accurate exposure. I use Lastolite EZ Balance targets instead, because they're flexible and fold up for storage. But they do essentially the same thing as a gray card.

There are other things you can use... even a plain white piece of paper can work pretty well in an emergency. Something else that's neutral gray or solid black can work, too.

There are also Warm Cards, which have a slight tint to bias the color your camera renders... A faint cyan tint causes a slightly warmer image... A little yellow makes images cooler... The Warm Card set includes one or two special fluorescent cards, too... Plus a neutral 18% gray, plain white and solid black.

The result with a custom white balance is far more accurate than the preset white balances built into many cameras (which are just guesses or approximations, at best).... or than setting the Kelvin temp yourself. White Balance is actually two different things... Color Temp (blue/yellow axis) and Color Tint (green/magenta axis). If you dial in a Kelvin setting you're only setting one of them: Color Temp. To set the Tint needs a separate setting.

Most digital cameras have Auto White Balance, too. That may or may not work better. Some types of lighting fool some cameras.

It is far easier, faster and more accurate to simply use a target and a Custom White Balance... it usually only takes a few seconds to do, once you have a proper target to use and know how it's done on your particular camera.

And, yes, shoot RAW so that if it's needed you have more latitude to adjust the image afterward.

Oh, and if your computer monitor isn't calibrated, you'll have a hard time properly adjusting or even very accurately evaluating the color of your images.

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Feb 8, 2016 15:53:02   #
Gene51 Loc: Yonkers, NY, now in LSD (LowerSlowerDelaware)
 
Haveago wrote:
Hi all, I have a question regards these photos. They were taken handheld inside a large building with tube lighting, people playing bowls. I adjusted the cameras white balance for strip lghting but all the photos have come out with a Blue cast. All the photos are JPEG, next time I'll do RAW aswell.

Anyone out there have suggestions for:
1. Any in camera adjustment I can do so it don't happen again?
2. Is there a way I can adjust the photos in camera BEFORE I format the card.
3. How to get rid of the blue cast using Photoshop, Lightroom, GIMP or Picasa?
Many thanks for any guidance.

Baz
Hi all, I have a question regards these photos. T... (show quote)


Strong blue and green cast. Wrong white balance setting, but not sure how you got the green cast.

Don't bother shooting raw+jpeg. Shoot raw and use the resulting jpeg as your distribution and uploading format. You will drive yourself crazy with all the versions of the same thing. With an efficient workflow, your basic needs will be the raw and corresponding xmp, and a psd "working file where you make your post raw conversion fine tuning and adjustment.

Jpegs can easily be generated from the psd. If you have alternate "takes" on a post processing treatment - a B&W version, an artistic texture, high key/low key/high contrast/low contrast/creative composite etc - then you will have additional psds for those as well.


(Download)

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Feb 8, 2016 16:02:49   #
tmehrkam Loc: Houston,Tx
 
I wonder if the strip lighting has been upgraded to LED. Here in the states you can purchase LED tubes that look like Florescent. Some of the early LED's can be very blue.

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Feb 8, 2016 16:05:05   #
Bill_de Loc: US
 
Gene51 wrote:
Strong blue and green cast. Wrong white balance setting, but not sure how you got the green cast.



Nice work Gene!

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Feb 8, 2016 18:36:34   #
Haveago Loc: Swindon, Wiltshire. UK.
 
Blimey what a response not got 1/2 way through yet.

&#9786;

Baz

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Feb 8, 2016 20:02:22   #
DirtFarmer Loc: Escaped from the NYC area, back to MA
 
amfoto1 wrote:
...To prevent this in the future, set a custom white balance....


To prevent this in the future, shoot raw with the custom white balance. Or raw+jpg, if you prefer.

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