RE: advice or at least opinion

[Jim Dunn <jimmyd@xxxxxxxxxxxxxx>]

Jimmy,
	What is your reason behind this comment? I am curious.

"And heaven forbid you should use colour correction or enhancement filters
from different manufacturers."

>>>>>>>>>>>


Nowadays the colour balance in filter manufacturing is checked using Spectro
photometers connected to computers with calibrated software.  According to a
techy I spoke to at one of the filter companies last year there was no
international standard for cross checking the accuracy of production from
company to company....... No Q lab equivalent.
I believe at one time Kodak co-ordinated some form of international standard
for filtration, not sure what has become of this?? But presumably someone
has to have set a standard so the software could be calibrated.
Kodak once offered filters in 3 types (not sure if they still do), Ordinary,
Graphics Arts and Photomechanical each was of a correspondingly higher
standard of quality and accuracy.

Filters also fade depending on the exposure to light and the environmental
conditions, non of the filter companies will normally guarantee the accuracy
of a filter over the period of its working life.

Best  wishes

Jimmy

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Jimmy Dunn
Scottish Stock Photography
E-mail:  jimmyd@xxxxxxxxxxxxxx
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