Re: Neutral grey under different lighting
Re: Neutral grey under different lighting
- Subject: Re: Neutral grey under different lighting
- From: Graeme Gill <email@hidden>
- Date: Mon, 03 Sep 2007 10:49:00 +1000
Nov06 wrote:
in evaluating photographic labs I had them printing graduated gray
gradients to see how neutral their process is (and check for potential
black and white cut-offs). What I have noticed is that the prints looks
more or less neutral at daylight (between 5000 and 7000 K according to
my Eye-One) but have a pinkish/magenta-ish cast when viewed under
normal fluorescent office light (about 4000 K). Interestingly, my
standard grey reference card shows none (or much less) of these
differences.
Sounds reasonable. Real daylight is very broad spectrum, whereas
fluorescent office light in particular, is built for efficiency
and cheapness, so has a very "spiky" spectrum. A neutral card is
usually built with a spectrally flat pigment (such a carbon), so it
will look neutral in any lighting, whereas photographic film is based
on CMY colorants, which can never produce a spectrally flat grey.
Add a "bumpy" grey color to a "bumpy" illuminant spectrum, and it's
no surprise the result doesn't quite look grey.
Graeme Gill.
_______________________________________________
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