Re: Colour Temperature
- From: "RSD99" <rsdwla.NOSPAM@xxxxxxx>
- Date: Mon, 15 Aug 2005 15:44:14 GMT
"Mike Cook" <mjcook@xxxxxxxxxxxx> wrote in message
> "Rob Novak" <rob.novak@xxxxxxxxxxxxxxxxx> wrote in message
> > On Sun, 14 Aug 2005 07:13:04 GMT, "Mike Cook" <mjcook@xxxxxxxxxxxx>
> > wrote:
> >>I took a picture and the light was a mixture of Sodium and Daylight ,
> >>would the colour temprature be?
> > That looks more like mercury-vapor or HID lighting (combination of
> > xenon, mercury, and other halides). Pure LPS sodium-vapor is
> > typically very yellow, and that isn't, nor does it look like HPS
> > lighting, which normally has a pinkish-orange cast.
> > Mercury vapor and HID are fractured-spectrum lighting (not continuous
> > emission), and have an average color temperature near that of
> > daylight: 5200-5900K depending on the halide component and the use of
> > phosphor coatings. Keep in mind that they emit their light in fairly
> > narrow bands, so even though the overall temp is daylight-ish, they
> > don't tend to render colors accurately.
> Thank Rob , very detailed answer. Im going back to this location next
> and will have more time to check what type of lighting is used. The image
> posted had not been corrected and was taken using AWB
You posted that "... Im going back to this location next week
and will have more time to check what type of lighting is used. ..."
Take a picture of an 18% Gray Card ... at the exact time of day, and using
the exact same camera settings ... and you can use that picture to set up
'Color Correction' in PhotoShop.
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