mirage
Posts: 3612
Joined: Mon May 31, 1999 4:44 am

How To Correct Night Yellow Lights?

Fri Nov 21, 2003 7:18 am

What are the appropriate steps in Photoshop to eliminate the yellowish aspect generated by airport yellow illumination such as in this image bellow?

Do you play with Color Balance and Selective Color or is there another way?

For example, this fuselage is white, I don't want to make it white in this situation because it would look unnatural but I would like to eliminate the yellow tone.



thanks
Luis
 
wietse
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RE: How To Correct Night Yellow Lights?

Fri Nov 21, 2003 7:28 am

Might not be the most professional answer possible, but a quick tap on the Auto levels function did quite some good!

Wietse
Wietse de Graaf
 
serge
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RE: How To Correct Night Yellow Lights?

Fri Nov 21, 2003 7:38 am

Luis,

You can always go to the hue/saturation box and select the specific color of the cast then increase the lightness (only for the color thats harming the image) and/or decrease the saturation. Always works great for me and produces a more natural white light - I tired it on your image however and it didn't work the best, maybe it would with a larger size version?

Serge
 
mirage
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RE: How To Correct Night Yellow Lights?

Fri Nov 21, 2003 7:49 am

Thanks, both suggestions gave me new tools that really make difference. The Auto Levels was a good surprise to me  Wow!, hue/saturation permits fine tunning  Smile

Luis
 
wietse
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RE: How To Correct Night Yellow Lights?

Fri Nov 21, 2003 7:52 am

Luis, be careful when using it. In shots taken in sunlight the contrast tends to get too high after using the function
W
Wietse de Graaf
 
mirage
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RE: How To Correct Night Yellow Lights?

Fri Nov 21, 2003 7:57 am

Yes Wietse, my "problem" was only with night ramp shots, I was looking for a method to eliminate the yellow tone caused by artificial illumination.

Luis
 
wietse
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RE: How To Correct Night Yellow Lights?

Fri Nov 21, 2003 8:01 am

Yeah I know, but when you have a sunlight shot and you think the color balance isnt completely on target, you can use auto levels too. Just lower the contrast afterwards.
Wietse de Graaf
 
mirage
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RE: How To Correct Night Yellow Lights?

Fri Nov 21, 2003 8:08 am

I see, sometimes auto levels work but with sunlight I prefer to slide manually the levels bars across the histogram. However, at dusk, some images are very difficult to be corrected, if you increase light you increase noise, if you don't increase you get some parts completly black with no detail.

Luis
 
ExitRow
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RE: How To Correct Night Yellow Lights?

Fri Nov 21, 2003 8:22 am

Luis,
If you're shooting RAW and using Photoshop 7 with the RAW plug-in or Photoshop CS, you can adjust the temperature and white balance before converting to the Photoshop workspace.

I would also advise using the color balance bars and move the sliders away from yellow.

Good luck.

William
 
mirage
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RE: How To Correct Night Yellow Lights?

Fri Nov 21, 2003 8:48 am

Thanks William, I don't shoot RAW but the help so far is enough for my needs.

Luis
 
photopilot
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RE: How To Correct Night Yellow Lights?

Fri Nov 21, 2003 9:55 am

One other method that works quite well is in Photoshop convert the file Mode to CMYK, then I go to the Adjust Curves, select the yellow curve and adjust the yellow out. Especially if you lower the yellow curve from the highlights it works quite well. Then convert back to RGB and adjust levels, or Auto levels if it doesn't go too far.

Steve
 
UngoMongo
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RE: How To Correct Night Yellow Lights?

Fri Nov 21, 2003 6:03 pm

Luis,

Check out this site:
http://www.gurusnetwork.com/tutorials/photoshop/curves3.html

By the way, it has some really neat descriptions in effects.

Cheers

Kenneth
Becoming a dad is the greatest.
 
ckw
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RE: How To Correct Night Yellow Lights?

Fri Nov 21, 2003 7:20 pm

On the use of auto-levels/auto-contrast, I find this tends to produce far too contrasty an image, however, it does often help with the colours - it's just too extreme. A useful trick to remember is that in PS, most effects can be faded - under the Edit menu, you should see "Fade [last command name]".

Knocking back an "auto" command to between 30-50% often gets you in the ballbark.

For this kind of shot, though, you might want to try thinking of it photographically - what filter would you use to alter the colour temperature?

Photoshop CS has a number of standard colour correction filters built in, but there are plenty of plugins available for earlier versions of PS.

Cheers,

Colin
Colin K. Work, Pixstel
 
mirage
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RE: How To Correct Night Yellow Lights?

Sat Nov 22, 2003 2:26 am

Thanks all for the great help. Colin, about your question, I don't have photography theory knowledge (unfortunately), I simply don't know what kind of filter can alter the colour temperature.

But, on the other hand, I don't want to use filters because I don't want to buy a 72mm filter when I can use Photoshop to make the adequate corrections later at home. If Photoshop didn't exist I would think different  Smile

Luis
 
RyDawg82
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RE: How To Correct Night Yellow Lights?

Sat Nov 22, 2003 6:25 am

While I know your question refers to how to work with the image after the fact, I have had pretty good luck myself with using the white balance feature on my camera (Sony F-707) at the time of spotting. Either nighttime ramp shots and/or cabin shots (sporting the wonderful Boeing Yellowish Interior) are greatly improved with these settings. Leaves little to be done in Photoshop afterwards.

This shot was taken with full yellow lights, used the white balance feature, and she's white! Don't know if this is good practice, but it works for me.

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Ryan

[Edited 2003-11-21 22:32:06]
You can take the pup out of Alaska, but you can't take the Alaska out of the pup.
 
mirage
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RE: How To Correct Night Yellow Lights?

Sat Nov 22, 2003 6:36 am

Interesting Ryan, did you made a custom white balance or is that an auto function of the camera?

Luis
 
photopilot
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RE: How To Correct Night Yellow Lights?

Sat Nov 22, 2003 8:55 am

The correct filters for converting TUNGSTEN lighting to Daylight color balance film (or digital) is an 80B. An 80A is slightly less blue, while the 80C is slightly darker blue.
However not all airport lights are Tungsten lighting. Many lights today are High Pressure Sodium bulbs which have a very narrow color spectrum and are virtually impossible to filter correctly without a color temperature meter and a full range of CC filters. If you can do it in Photoshop it is a whole lot easier and less costly.
If the lighting is fluorescent (cool white bulbs), then use a 30M (magenta) to get rid of the green cast. For warm white bulbs about 20M will usually do.
The only people that really have to worry about doing it in the camera are those who shoot color transparency films.

Steve
 
RyDawg82
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RE: How To Correct Night Yellow Lights?

Sun Nov 23, 2003 8:14 am

Luis,

That is is using the standard white balance correction on the camera (Sony F-707). It corrects the colours greatly. It's not 100% perfect, however it made things much easier, especially cabin shots.

Ryan
You can take the pup out of Alaska, but you can't take the Alaska out of the pup.
 
Lear45
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RE: How To Correct Night Yellow Lights?

Fri Nov 28, 2003 7:07 am

I use the F-707 too, and I carry around a piece of white paper taped to a bit of cardboard at night. With the 707 you select custom white balance, and then press a smaller button under the white balance selctor button, while holding the white board in front of the camera illuminated by the ambient light, whatever that may be. At Newcastle we have white lights and orange lights, so I have to set the white balance accordingly to whatever stand the aircraft is on.


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Andy
 
Skymonster
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RE: How To Correct Night Yellow Lights?

Fri Nov 28, 2003 8:00 am

Not difficult... Usually, I find it easiest and quickest to identify an area in the photo that should be white, and then go into adjust levels, click on the white point selector (dropper) and then click on the white point I've decided on in the photo. Result - viola...

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Andy
There are old pilots and there are bold pilots, but there are no old bold pilots
 
TZ
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RE: How To Correct Night Yellow Lights?

Fri Nov 28, 2003 8:08 am

One very tricky scenario, either directly from the RAW image or by using levels, is when half the aircraft is in white-ish light and the other half in orange lights.

I guess one could convert the image twice then "composite" the two images in Photoshop, but that's cheating. I find that leaving a little orange hue in the image looks better than having too much blue hue (which is what you get if you overdo it).

This was certainly the most difficult one I have attempted to adjust. Every light in that shopping centre gave out different colours. I'm not saying that I succeeded, by the way!

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Tamsin
TZ Aviation - Aeropuerto de los Banditos Team Images
 
Granite
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RE: How To Correct Night Yellow Lights?

Fri Nov 28, 2003 8:36 am

Hi all

For reference, Photoshop CS (8) has a Photo Filter menu and when you select the Cooling Filter, this reduces the amount of yellow.

Images look pretty good.

Cheers

Gary Watt

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