Guy Johnstone wrote:
No it doesn't work. If you have a dominant color, your middle grades will shift radically. I've taken two copies of your dinosaur photo and added some color. Then I went ahead and used your averaging technique. I have applied the same technique on both photos. The middle grays should be the same in both photographs, clearly they are not. Try it yourself.
I think perhaps that I have been overstating the case that it works.
I never meant to imply that The Nekon Method will work every time with every picture or that it can make a silk purse from a sows ear. It is a
shortcut, which will (obviously) work best with out-of-balance pictures of
average tones and colors. I also think, however, that perhaps you may be overstating the case that it
doesnt work. If I implied that The Nekon Method will perfectly correct
any out-of-balance picture, I apologize. My signature line says
"I know you believe you understood what you thought I said, but what you heard was not what I meant." :-D
I absolutely agree that,
If you have a dominant color, your middle grades will shift radically." But this method is not intended for the real catastrophe, as in your examples above, but rather for the
average 80% of goofs, which I think it can fairly easily, and quickly, fix. :-)
In the original example, my tiny P&S cameras auto-WB failed to self-correct for fluorescent lighting so the picture shifted green. When I first made that picture I was able to correct it easily using the correct color cast tool in Elements 2.0 that I had at the time.
The only difficulty was figuring out where to click. The correct color cast tool in Elements may not even exist in full-dress Photoshop, but in Elements you simply click on something in the image that should be white, or gray, or black, and it works. The challenge is finding something that is actually white, or gray, or black, to click. In the extreme cyan example that you used for your examples, I clicked in what youd assume was a dead black, but the tool yielded the dreadful cyan example instead. Normally I'd just keep clicking until I found a spot that gave the correct color balance, but
What The Nekon Method does with an
average file is
average everything in it, tones and colors, so that you can correct it to neutral gray in levels with one click. IF the picture is pretty much average, it will drop right into place like magic. It will probably be exactly where it should have been if the white balance had been correctly set in the first place. That's exactly what "The Method" did, essentially with a single middle-gray click, on the original green-shifted fluorescent-lit example. One click and done. :) You are quite correct, though, that it will not work
at all with the extreme examples you provided with a very dominant color, but how often do any of us have something
that far out that we don't beg to reshoot it?
As an experiment, however, I also took the worst example I could findthe underexposed rock shot in full sun with the white balance on tungstenand reworked it with The Method to see how well it worked with something "not average." The first try, just averaging the tones and colors, dragged it back to some semblance of normal, but it still needed more tinkering, and it will never be perfect, and I think I clearly said so. I never meant to imply that I thought that was a "good picture." What I meant to convey was:
If you have made some goshawful mistake, especially if you shot it in Jpeg, you can drag it back at least partway from the brink with this shortcut.I totally see your point, so I did not use the really egregious examples you supplied, but went back to the same awful cyan thing and dragged it back using first The Nekon Method and then some more tinkering. The purpose of this exercise is not to prove that The Method works every time on every picture, but rather that
it can work well enough in an emergency to sort of save something that would otherwise be a disaster. I was a working pro for 30 years, long before digital, and ALL I ever cared about was getting a usable image for the client, but we all make misteaks :) . Any of us would have cheerfully murdered for Photoshop or anything like it sometimes. The examples below are not meant to show that "it works," but rather that it at least can get you to a place to start.
The cyan-shifted original before any corrections
With the first averaging mask applied; you can see from the color that it is averaging cyan, as expected.
The averaging mask has been "corrected" with a single click of the gray eyedropper in Levels. It now looks remarkably like a Kodak 18% gray card.
With the averaging layer turned off, the thing is predictably still cyan (or blue, or something), but less so; a place to start.
After some more "tinkering," THE THING IS STILL AWFUL, but not as awful, and might by some be accepted as a "save." And that's from what I think is a pretty bad starting image. It certainly won't work on everything, but I think it will work well enough on most "misteaks" to at least get you to a place to begin. :)