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Photoshop correction of greenish color from fluorescent lighting?

Christopher Hawkins , Feb 02, 2002; 09:50 a.m.

After shooting with NGH II and scanning, the images have a distinct greenish cast. I haven't been able to eliminate the greenish hue and retain skin tones in white folks. I've tried using curves, hues, or color balance. How can a correct the color using photoshop? The images will be both projected onto a screen and printed onto photopaper using a Fuji Frontier printer.

Many threads discuss dealing with fluorescent lighting using filters, etc., but alas, I didn't do this. Maybe next time I'll remember that an ounce of prevention is worth a pound of cure. :-(

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John Chennavasin , Feb 02, 2002; 01:09 p.m.

The quickest method is to use the hue/saturation adjustment in Photoshop, and adjust the hue and lightness on the greens only (as shown in the diagram). The eyedroppers are used to finetune the colors selected for adjustment. This will leave the other colors largely untouched.


Hue/Saturation Adjustment

John G. , Feb 02, 2002; 01:13 p.m.

I wouldn't believe that you can't remove the green, substantially reduce it, or at least change it to a more pleasing blue with HUE/SAT. You might have to quick mask if you need to hold any other greens in the image. If all else fails you could try to erase the green channel in the offending parts. Do you want to post the example?

Steve Bingham , Feb 02, 2002; 01:21 p.m.

Chris,

This is a simple color balance problem. I do not agree with the above solution but I mean no disrespect. Go to image, adjust, color balance. Select the mid tones option first. Slide the magenta/green slider toward magenta about 10%. Have the preview box checked and adjust to taste. You may choose to also adjust both the highlights and shadows. Lastly, you might even need to take a little yellow out. Good luck.

Steve

John G. , Feb 02, 2002; 01:30 p.m.

Steve- If the color is too green throughout the entire image, a global adjustment as you described should work , but I suspect that there is an on camera flash involved. We don't know unless he posts it.

Chris Gillis , Feb 02, 2002; 01:34 p.m.

Is suing curves do not work (and they are the most essential tool here), modiy that tweak with Steve's suggestions. the other solutions to this problem will create problems elsewhere in the image, I suspect. A selection of the offending cast posted might help.

Andre Vallejo , Feb 02, 2002; 01:50 p.m.

Every one should read Dan Margulis book on color correction. I use and study Photoshop for over 8 years,and it changed the way I see things... correction by the numbers is a very good way to solve hard things...

Chris Gillis , Feb 02, 2002; 02:10 p.m.

Andre is the most correct. I get tired of saying reads Dan's book, but you'd never ever have a question like this if you read the first half of it. Essential.

Mike Buntag , Feb 02, 2002; 04:39 p.m.

Adobe PhotoShop has a number of color correction tools. Aside from Hue/Saturation and Color Balance, you can also use the selective color and Channel Mixer options also found under the Image/Adjust menu. You can apply all of these image adjustments as Adjustment Layers (Layers/New Adjustment Layer)and overlay them over the original image. Hope this helps.

Mark Wilkins , Feb 02, 2002; 04:50 p.m.

Note that adding magenta is the same as removing green and increasing the exposure, which is what you do when you use a magenta filter to correct for a fluorescent green cast.

Shifting the hue is *not* desirable because it will shift hues with no green at all, such as red or blue, which will look very unnatural.

-- Mark


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