On 10/06/2021 21:21, NY wrote:
"williamwright" wrote in message
...
On 10/06/2021 15:09, Fredxx wrote:

It is well known that fluoros have an overall green cast.

It may be well known to you, but you don't have the two lamps near
side by side to make a comparison.

I think maybe the belief that fluos have a green cast comes from the
was film and sensors respond to their spectrum.

It is certainly a lot more exaggerated on colour slide film (especially
Kodachrome) than to the naked eye. Colour negative film is affected too,
but most print labs correct for colour cast. I remember taking two
photos on colour neg, one by fluorescent light and one by tungsten
light, without any colour-correction filters. Apart from differences in
the shadows and reflections off shiny objects, the two prints were
pretty much indistinguishable, even though there was a big difference in
the negatives.

I've not seen the green cast with fluorescent lights with a digital
camera. Depending on what colour temperature preset you use, you get
either an orange cast or a blue cast (or no discernable cast), but never
a green one. So there's something about digital sensors which means they
don't suffer from it to the same extent - or else if it present at the
sensor, it is automatically corrected by the sensor-processing. That is
true of "raw" DNG files, as well as JPG which may have some normalisations.

The colour pigments used in a Bayer filter are likely to be a better fit
to the eye sensitivity than a photographic emulsion. There are still
issues about sensitivity to near IR which is generally filtered
separately - off plane, usually within the lens.