The lower gradient part of CI uses the same basic theory as the fractional gradient method. Long toed films are where the influence is greatest.
Originally Posted by AndreasT
Film speeds don't change much with fraction gradient / Delta-X. The pre 1960 standard didn't have an aim contrast for film development (it did have a minimum). While the Delta-X Criterion uses a fixed density point, the Delta-X point moves in relation to the fixed point as the average contrast changes. This tends to compensate for the shifting of the fixed density point.
Last edited by Stephen Benskin; 02-28-2013 at 01:37 PM. Click to view previous post history.