Callier effect
Callier effect
- Subject: Callier effect
- From: "Mark Rice" <email@hidden>
- Date: Thu, 21 Jul 2005 15:30:46 -0400
That is exactly the point - scanners do not have a collimated lights source
-not even drum scanners. Remember the old condenser enlargers we used to use
for B&W enlarging? They had a collimated light source (different than the
lens of a drum scanner, and they produced a lot more contrast and sharpness
than a diffuser enlarger. A scanner is the equivalent of a diffuser
enlarger.
Mark Rice
email@hidden
www.zero1inc.com
>I believe you will find Callier Effect only occurs with collimated light
passed through a silver emulsion. Diffuse light >>does not exhibit Callier
Effect. The effect on scanning would depend on the light source type and
optical system (if any) >used to deliver the light to the film.
> Scanning B&W silver based film almost certainly does not come out
> neutral, because of the Callier effect - the scattering of light due
> to solid grains of silver. Conversion to grayscale, via standard
> conversion or channel mixing is definitely required.
>
> Mark Rice
Jeffrey Stevensen Photography
82 Gilman Street
Portland, ME 04102
207-773-5175
www.jsphotographs.com
email@hidden
_______________________________________________
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