Originally posted by rechmbrs Boy has this turned up a wealth of knowledge. Thanks all.
I still would like to know how much control that Pentax has in CFA building process for the K 1. Any one of you spied a set of spectral responses for k1 and d8xx CFA? Why do I want to know? I'm seeing many more images with multiple differing light sources and would like to know how to handle the color balancing best method.
Thanks,
RONC
As stevebrot said, that's a very deep topic.
There's a very long chain of elements of the system that define and modulate the spectral properties of each and every wavelength of the light:
------- The Scene:
1. the original light source (e.g., the sun, incandescent bulb, LED, CFL, flash, neon lights, etc.)
2. any reflectors (e.g., blue sky, green leaves, a red car next to the bride, the T-shirt of the photographer, a warming reflective disk, etc.)
3. the subject's coloration and reflectivity (e.g., skin, dyes in clothing, pigments in plants, etc.)
------- The Camera:
4. the lens and any filters
5. the Bayer filter
6. the intrinsic detector response of the silicon chip
7. differential electronic or digital amplification of the RGB channels
----- The Post Process:
8. demosaicing (estimates the scene's RGB levels from the measured RAW RGB values)
9. color balance and post processing (saturation, curve manipulation)
10. the output device (monitor, printer)
11. viewing conditions (color of the lights & room around the monitor or print)
Your job as photographer is to get a nice result in step 11 that reflects (ha! pun intended!) the colors of element #3 (the subject) despite all the stuff happening in other steps of the system.
To do that, the first line of action is to control the light source (#1) and reflective items around the subject (#2) with possibly the aid of filter on the lens (#4). A few controlled shots with a color checker can also help calibrate the system (which is what technical photographers do for getting high fidelity images of art and museum pieces).
Of course, many situations don't offer such control (the bride is standing under her favorite green tree next to her red car on the left with blue sky lighting her on the right) which means you're going to be spending a lot of time in step #9 trying to keep the bride from looking like she was splashed by pastel Easter egg colors. (Maybe this is why some photographers shoot black-and-white!)