It's a judgment call on your part and depends on the image. Using a
reflection or glare may limit the contrast in the rest of the image more
than you want, more than if you set the white point elsewhere than on the
highlight. Other times the actual color of the highlight may be other than
white, and the color balance in the rest of the image may be changed by
using the reflection for a highlight.
Or it may work out fine. Dan Margulis is the one who said not to use it,
but his book doesn't go into too much detail as to why.
----- Original Message -----
From: "Rob Geraghty" <email@example.com>
Sent: Thursday, July 26, 2001 1:43 AM
Subject: filmscanners: Re: autolevels was re: filmscanners: Vuescan blue
| Maris wrote:
| > Sometimes you can't use anything - rather than using the
| > eyedropper you just have to guestimate - trial and error -
| > until the number for a near-white spot are near-white but
| > not-quite-white numbers.
| OK, let me rephrase the question slightly - isn't the intention of the
| and white point to define where the minimum and maximum brightness points
| are? If so, why is a point of sun reflection in a photograph not a good
| point to use for the white point? Because it's not representative of the
| majority of the image?
| Rob Geraghty firstname.lastname@example.org