Re: [APML] Tri Color Filter Help!

[Chuck Vaughn <aa6g@aa6g.org>]

Jim,

Their comments are quite subjective and I don't know what they mean by 
them.

I think we've settled that 500nm is pretty green but not pure green. 
I'd say halfway between cyan and green.

In a previous discussion of wavelength vs. color in 1998 I asked what 
colors correspond to what wavelengths. I received a useful answer from 
Bert Katzung which I have include below. This may be insightful for you.

Chuck <aa6gaa6g.org>

-------------------

Hi, people:
I checked my handbook of chemistry & physics (CRC), 51st edition, 
1970-71.
On page E-204 it gives the following table:
(actually they give the wavelengths in angstroms, so I've converted to
nanometers)

Visible spectrum 400-700
Violet, representative 410, range 400-424
Blue, representative 470, range 424-491
Green, representative 520, range 491-575
Maximum visibility 556
Yellow, representative 580, range 575-585
Orange, representative 600, range 585-647
Red, representative 650, range 647-700

The fact that they use the word "representative" indicates that they
recognize the subjective nature of color perception, but they are 
willing to set limits to
the range for each color. Might be useful.
Bert
Bert Katzung
San Rafael, CA
katzung@pacbell.net

--------------------------------

> Chuck I eMailed Hutech about their RGB spectrum to see the reason for 
> the
> design. Here's their response:
>
> Jim,
>
> It is intentionally designed so to create OIII more
> greenish. In our design concept, this is more
> natural and better overall color balance.
>
> Could this possibly be accurate? I thought the human eye sees the 
> spectrum
> of around 500Nm as GREENISH BLUE!?
> Jim


--  APML Archives at <http://astro.umsystem.edu/apml/>  ---
             Unsubscribe at <majordomo@seds.org>