Re: Sunlight
Re: Sunlight
- Subject: Re: Sunlight
- From: David Scharf <email@hidden>
- Date: Sun, 18 Nov 2007 15:02:00 -0800
Hi Roger,
I think that the depression of blue and UV may have to do with the
seasonal variation due to the fact that the sunlight is reaching you
through a greater angle, going through more atmosphere. There is
typically much less UV in the Winter season and it probably takes some
of the blue too. I'm pretty sure that NOAA or NASA would have such
studies published.
Did you point your Spectro directly at the sun? Would that be safe for
the instrument?
Regards,
David
--
*DAVID SCHARF PHOTOGRAPHY*
Scanning Electron Microscopy
Phone 323-666-8657
Los Angeles, CA 90039
http://www.scharfphoto.com
http://www.electronmicro.com
Roger Breton wrote:
Hello folks,
I have uploaded a PDF for discussion, here :
http://homepage.mac.com/graxx/FileSharing4.html
Hope you can all access and view it. It's a PDF I created that compare a
measurement of direct sunlight, made with the Spectrocam, entering my home
studio and D50, in the range of 350nm to 750nm.
In my measurement, it is clear I lack some energy in the "blue" part of the
spectrum. This, I suspect, is due to the fact that I was only sampling
'direct sunlight' and there were no contribution for 'skylight'. If we
disregard that aspect of the measurement, I think this spectrum is pretty
convincing of what 'real" direct sunlight ought to looks like for the
latitudes I live in (and given the fact that the light I measured was
partially filtered with the glass of my window, which might absorb some
energy at some wavelengths).
The question I have is how best to measure the 'mix' of skylight and direct
sunlight to better correspond with D50?
Roger Breton
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Colorsync-users mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Colorsync-users mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden
| References: | |
| | >Sunlight (From: Roger Breton <email@hidden>) |