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Different colored light sources in a room !!

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  #1  
Old 05-25-2010, 01:06 AM
Ricardo Ricardo is offline
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Different colored light sources in a room !!

Hi All,

I need a few suggestions on how to overcome this problem.

I'm shooting a couple of rooms in a building using the ambient light and the daylight that comes through the windows. Now, in the days of film I would have gelled the different lights depending on their color temp and neutralised the whole room and then shot it.

What I want to do now though is find a way of shooting the room without gelling and then evening out the different colors in PS.

I'm assuming I do a white balance for each of the different areas of the room and then work in layers to blend the different neutralised parts of the room to get one overall corrected colour balance.

is this the way to approach it?

Could I get any pointers on how to get the best results?

Thanks in advance.

Ricardo.
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  #2  
Old 05-25-2010, 04:28 AM
girlsfather girlsfather is offline
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Re: Different colored light sources in a room !!

Hi Ricardo,

If you will not use gel filters you can do different conversions later.
Depending on the different light sources (tungsten, flourescent, LED, daylight, fill flash....) you have areas where you have a mixture of different lights.
This makes it hard to even the light in PS.
But it depends a lot on the room.
To even the color of the differnt lights in PS you have to create good masks.
Halftone-masks, that include all the light gradients and areas where different light sources come together.
In a neutral grey, or white, room this would work perfect.
But, as the colour of the room objects (furniture, walls, floor etc.) adds to the colour of the pixels it could get hard, or nearly impossible, to create good masks that help to get the same result.
So, in other words, it might be really difficult to get somewhere near your former results - depending on the subject you shoot.

If you had good results using gel filters, you could do the same using digital.

Both methods are time consuming.
Some lights are hard to filter (ceiling too high, no possibility to hide the gel filter...).
So you have to check the location, doing available light test shots.
Try figure out if the PS only version works with that pictures.

Good luck!
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Old 05-29-2010, 05:44 AM
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gene_spark gene_spark is offline
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Re: Different colored light sources in a room !!

Hi, I think there is a nice Solution for your problem.
The Light from the Window is mor blue than yellow, and The Lights in the room are more yellow than blue. You have to look after the right mask...an this mask lives in the b.Channel in Lab...you have to pump up the contrast and blurr it...
A lot more Tricks you can do with Lab is in Photoshop Lab Color by Dan Margulis...


lg.
Gene
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Old 05-31-2010, 08:28 PM
Ricardo Ricardo is offline
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Re: Different colored light sources in a room !!

Hi guys,

Thanks for your feedback.

Gene, could you elaborate more on this method. I've never worked in Lab color mode before.

Do you mind giving a more detailed process.

Ricardo
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  #5  
Old 06-01-2010, 04:37 AM
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gene_spark gene_spark is offline
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Re: Different colored light sources in a room !!

Hi Ricardo
The good thing about Lab ist that this colormode seperates Color from contrast.
all the contrast is in the L Channel, the green and red Colors are in the A chanel and the blue/ yellows are in the b. If there is no color the a and b are in a neutral 50 % gray.
red and yellow are lighter than gray green and blue are darker. The more yellow the lighter the Channel is.

ok I would first correkt the Pic that the Room looks pleasing except the Daylight that is too blue, now you have to reduce that.


Duplicate the Picture, and reduce to Background, change mode to lab...thats all.
Go back to your original. selekt a Hue/ Sat Layer and and set the Saturation to -100 only to see whats goin on.---ok-
now you have to load the Mask:

if the mask on the Hue Sat is selected go to Image/ Applyimage choose your lab Source, and the b chanel: the blue is darker but you want to reduce the blue tint so invert the Chanel. ok

now you have to tweak the mask, with a curve and blur it slightly.
and of course now you have to play with the Saturation and Hue...


hope this helps

lg.
Gene
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  #6  
Old 06-06-2010, 11:03 PM
Ricardo Ricardo is offline
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Re: Different colored light sources in a room !!

Hey gene,

Thanks for that. I'll attempt to work my way through this.

Ricardo.
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