Study of Sensitivity Determination for Phototypesetting Films and Papers

Abstract

The authors investigated on determining sensitivity of phototypesetting films and papers, based on the exposure condition which the line-width of character could be correctly reproduced under.
The line-width is faithfully reproduced under the following conditions;
Film: The exposure to cause 2.0+ΔD density units.
Paper: Three times exposure to cause 0.7+ΔD density units.(ΔD is fog-plus-base density)
Finally, the authors propose to determine the sensitivity as follows;
Film: S_f=100/E (E: lux·Esec at D=2.0+ΔD)
Paper: S_p=100/3E (E: lux·Esec at D=0.7+ΔD)