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D200, color purple.........

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Steve wrote:
Could someone explain to me why in NC 5600K in daylight
Steve47416 said:
and 5600K in flash renders different color balance, I thought color
temp is color temp. Any ideas?
Comments are welcomed.
Click to expand...
Color temp is a balancing adjustment. Daylight color temperature varies all over the place with time of day, direction of the light, open shade and even latitude. A single daylight setting is only going to balance correctly for one temperature of light. Your flash is a constant color temperature. So it is more consistent.

I don't know exactly what you are doing, but most of the reviews of the D200 have commented on the very accurate color rendition and if you look at the photo in Thom Hogan's review there are two nice purple walls.
 
It depends a great deal on the colour frequencies which your eyes pick up and your brain interprets as purple. Some purples can be sensed by the D200 correctly but others it can't see due to the different frequency characteristics. If there's a lot of high-end violet then it'll probably be blocked out by the UV filter and you will only see the blue-end of the reflected spectrum from the object and it will be sensed by the camera as being blue. If, however, the colour is mostly produced by the near-blue end of violet then the camera may see it as a colour you will interpret as purple.

Eyes, brains and colour filters are strange things.
 
I was fighting with D70 turning everything blue into purple and found D200 provided accurate blue.

The flower looks not exactly blue or purple... sort of in between. Have you tried preset WB with white/gray card?

Also is your monitor hardware calibrated?
 
Sorry I was not reading... you've tried grey card. Maybe you can try with a blank white paper too? Last time I tried, D200 gave me accurate colors of red, blue, and purple under tungsten.

Also, why don't you just boost red channel in PP to make blue more purple?
Photobug said:
I was fighting with D70 turning everything blue into purple and
found D200 provided accurate blue.

The flower looks not exactly blue or purple... sort of in between.
Have you tried preset WB with white/gray card?

Also is your monitor hardware calibrated?
Click to expand...
 
As a previous poster suggested try the http://www.tribecalabs.com/home.htm web site it explains the issue(s). I shoot with the D2X and D2Hs-same issue, I have no affiliation with software but it does what it says and it was easier -for me- than constantly dinking around with LAB, white balance, etc. settings. YMMV.
 
What color is "purple"? Do you mean a color with a shorter wavelength
than blue? That would be "violet", and our eyes are certainly not
very responsive to those frequencies that we call violet.

Purple itself is not a spectral color: there is no single frequency
that can generate it. Rather, all the "purples" (including magenta)
are something that happens in your brain in response to a mix of
varying frequencies of red and blue light (and green, with metamerism).

But a digital camera with a reasonable chip and imager shouldn't
have as much trouble with this as you might believe. There are
dark purples that you can see and which you can print, but which
cannot be shown on a monitor. But I really do think you probably
mostly just have an issue with color space. Mode Ia doesn't seem
to be faithful to the purples. Mode IIIa is sometimes ok, but
Mode II is probably the most realistic.

These are all the same image, converted to sRGB for the
web only. Surely some of these count as purple!

Mode Ia:



Mode II:



Mode IIIa:



As are these:

Mode Ia:



Mode II:



Mode IIIa:



And these:

Mode Ia:



Mode II:



Mode IIIa:



See what a difference mode makes? The images above were all taken
with the an auto white balance. Here's the same set with white
balance set to 5400K.

Mode Ia:



Mode II:



Mode IIIa:



--tom
 
As others have mentioned, try DCF by Tribeca Labs. I stumbled into their booth at PMA this year, bought a copy to try. Nice people. Easy to use, works well to take care of what image sensors can't see. They have a downloadable free trial. See also the current issue of Shutterbug for a review.
 
nfll said:
As a previous poster suggested try the
http://www.tribecalabs.com/home.htm web site it explains the
issue(s). I shoot with the D2X and D2Hs-same issue, I have no
affiliation with software but it does what it says and it was
easier -for me- than constantly dinking around with LAB, white
balance, etc. settings. YMMV.
Click to expand...
The problem with those folks that I saw from a cursory
inspection is that they try to sell you their product
by viewing that back LCD from a digital camera
taking pictures of their screen shot. Well, that's
bogus, because I have yet to see any such screen
display colors accurately--PARTICULARLY in the
purples. And yet this does NOT interfere with printing
out the images in correct colors. So they're cheating
to get you to buy their product. That's not right.

I do wonder, though, why Nikon's LCD's are so
bad at this. You'd think you could get a metameric
match with the right RGB to cover most of the
purples, but they don't do that. Again though,
you can still print them.

--tom
 
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