Originally posted by patrickw Phil,
Believe it or not I came onto the forum tonight to post the exact observation you've made. I also find the K7 skies a bit too green, and I'm also shooting PEF files and using Lightroom 2.6.
The first thing to note is that when I demoed Aperture the K7 files didn't render with such turquoise cast to the sky. Also if you choose "Camera Standard" instead of "Adobe Standard" it largely corrects the turquoise skies... but unfortunately I find the colors when choosing Camera Standard to be otherwise inferior -- fake and over-saturated looking. Part of the frustration for me is that I prefer the look of Adobe Standard colors over the other two alternatives I've tried with the camera (Camera Standard and Aperture), except for the greenish cast to the skies.
I have been trying to come up with a preset in Lightroom to achieve a color balance that looks more natural to me. Of course part of the problem is determining what looks really natural, because our brains play tricks on us with color. Sometime in the next couple of days I am going to do a little test with a sky-blue coffee mug I've got so I can actually hold the mug up to the screen to compare the photograph with the object. Not a definitive test by any stretch (being photographed under tungsten lights it will be a somewhat different test of the color rendering) but it'll give me some more data to work with. Another thing I have started doing is shooting a few frames RAW+ each time I go out, so that gives me another color reference later on. (The in-camera JPEGs set to "natural" match neither Adobe Standard or Camera Standard colors fwiw).
Really I got serious about addressing this situation after I photographed some spray-painted graffiti, and the paint was a rather pure cobalt blue, and when I developed the RAW files in Lightroom it was very obvious to me that the color, now teal, was not at all what I'd just been looking at in person an hour before.
So far I have come up with a couple of different Lightroom presets that make the sky less greenish. One does it with the HSL pane and the other down in the camera calibration pane. I came up with these on photos that were dominated by sky and steel, and haven't addressed what they might be doing to grass and trees, etc., which will be the tricky part. Just to give you a starting point here are the settings of my Calibration pane preset at this point:
Green Primary:
Hue -4
Blue Primary:
Hue +15
Saturation +2
My HSL preset looks like this right now:
Hue:
Green -2
Aqua +5
Blue +17
This is very much a work in progress in its earliest stages so I'm not presenting those figures to you as a solution, just a starting point.
Maybe some others using Lightroom will suggest their own approaches to color.
Patrickw,
I really appreciate your forwarding the settings above, i'll start giving them a try. I probably would use a preset like this only when using Pentax glass. Having a mixture of Pentax, Sigma and Tamron glass, i recall blue skies with both the Sigma and Tamron glass. So it isn't just the camera but perhaps a combination of factors.
For those suggesting a shift to other software, that approach is certainly valid from all i've heard about SilkyPix software conversion, but i'm wedded to Lightroom now and would find it easier to use a preset than shift to a whole different software.
One think i'm going to try with future theatre shooting, is the manual Custom white balance that K20 offers. It allows me to sit back from the stage, take a picture with something white in the scene, and then select the white object (illuminated by whatever stage lighting is turned on) and do a white balance on that. In the past i've always done white balance after the fact on my RAW images, but it may turn out to be easier to get it closer up front.
Thanks again for all the info, just being aware of the possible issue is part of the solution in itself.