What is "Foveon Blue"?

PRISCILLA TURNER wrote:

xpatUSA wrote:

Take a colour temperature meter (I still have my old Weston) and face it carefully upwards to your sky. Make a note of the result.

I don't own a color temperature meter, but what would I have done with the result - apart from making a note?

Perhaps you missed my response to your earlier post?

No, I haven't missed anything.

You want to know what is the true colour of your sky or other light source. (The sky is a giant reflector, but that's another point, relevant to the colour of shadows in clear sunlight.) A colour temperature meter will tell you precisely in degrees Kelvin what the colour of your light source is. Note its reading. Adjust that part of your image using those data. Everything else, including items with other colours, will then fall into place.

My own sense is that in the middle of the day in most places the true colour of the sky varies from true blue to cyan (classical Greek for sky-blue) with no admixture of magenta. Earlier or later there's more red in the blue, as we can all see.

(Deciduous foliage is notoriously yellower in the Spring, darker green in late summer.)

Thank you, Priscilla,

I understand your point of view. As to the method, I'm interested to know if a color temperature meter can also show the tint or perhaps, instead, xyY coordinates or Lab or summat?

Here's my latest sky shot with the WB as close as I can get to achromatic in SPP (sunlight +3M):

No other objects in view to confuse the issue which, for me, is still what is the correct WB for a pure source of light.

Boring, eh? Going to try it on watch hands soon . . . that'll take care of green then I've got a couple of red heat lamps to play with . . . 'Foveon Red' thread next?