[LRflex] Re: Was: Concentration; Now: Colour of light.

I am planning on doing recordings today. I boarded the OHS bus. I am doing better today.
I may need surgery. My plan is to have that done AFTER your recordings. I may need some assistance carrying and setting up in Houston. 

We


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On Jul 17, 2008, at 7:40 AM, Aram Langhans <leica_r8@xxxxxxxxxxx> wrote:


Yeah.  What he said.....  :-)

Aram

> From: neil@xxxxxxxxxxx
> To: leicareflex@xxxxxxxxxxxxx
> Subject: [LRflex] Re: Was: Concentration; Now: Colour of light.
> Date: Thu, 17 Jul 2008 07:05:01 -0400
>
> Hi David,
>
> Sorry for the "late" reply, as I'm on the digest only. You've received lots > of good information and suggestions from Ted, Etienne, and Aram, so what I > have to offer is a little expansion on your general quest to color correct > the light from various sources. Unfortunately, the link to your comparison 
> images didn't work this morning, so my comments are very general.
>
> > Date: Wed, 16 Jul 2008 07:03:32 -0700
> > From: David Young <dsy@xxxxxxxxxxxxxxx>
> > [...]
> > The light on the Ball mill side is provided by some sort of lamps,
> > the likes of which I've not seen before. The images have a yellow
> > cast similar to that provided to daylight film when shot under
> > tungsten light, but much more so.
> >
> > Experimentation has shown that the colours can be restored to some
> > semblance of what I remember by reducing the colour temperature to
> > 2000 Kelvin (my RAW software, Silkypix, will not permit going any
> > lower). However, if I do this, although the colours come closer to
> > what I saw, they take on a surreal look. While the mill's walls are 
> > starting to come close to their "natural" colour, the greens are
> > still too weak, and the yellows much too strong. Not to mention that > > in spots, they disappear all together, when they really were there, 
> > in the mill!
> >
> [...]
>
> The main problem is that there has to be color content in order to adjust > it! While many light sources "color" a scene by having spikes at one or more > location in the color spectrum, they also emit light energy across much of > the rest of the spectrum. So, filtering out the spike(s) leaves a more 
> balanced scene because of the content in the rest of the spectrum.
>
> Light sources that only emit a narrow band of light will not provide
> significant illumination (if any) in the rest of the color spectrum, so 
> there is nothing in the recorded image to adjust! making broad-based
> adjustments such as changing the overall color temperature will only result > in filtering the light in the range of the illumination, so the image can 
> take on a posterized look.
>
> Just as our minds can "fill in the blanks" when viewing a b/w image, the > same happens under other monochromatic lighting conditions. I suspect that > there are details that aren't recorded in the b/w version of your image as 
> well, but the expectations may be different.
>
> Best regards,
>
> Neil Gould
>
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