TM 5-3610-257-14
(6)
If highlight density is greater than .30, operator must subtract highlight density from shadow density
and set this copy density number on flash dial opposite lamp marked FLASH TEST.
Example:
1.80 Shadow density
- 0.32 Highlight density
1.48 Copy density range
k.
Short range copy (very flat copy). When density range of copy is less than density range of screen, a
change in basic screen range is needed to match short copy range. The technique is to subtract from the main exposure
and increase the no-screen highlight exposure to compress screen range and add contrast to flat copy.
(1)
Subtract .30 from normal screen range.
(2)
Divide MAIN UNITS in half.
(3)
Double highlight exposure.
NOTE
Procedures 1. through n. are accomplished sequentially.
1.
Basic screen range (gray screen, negative type). Basic screen range test for a gray screen is made with
only a main exposure (3-6.3g).
(1)
Adjust exposure to place a 95% dot (5% printing) in step 1 of gray scale.
(2)
If test negative is too open in step 1, refer to "Density and Time Units Compensation Table" (3-6.3g).
(3)
Record basic density range of gray screen on exposure record card.
(4)
Place basic screen on flash dial (3-6.3d).
m.
Flash test (gray screen). Basic flash test procedures for a gray screen is same as flash test in paragraph 3-
6.3i.
NOTE
•
With a gray screen, yellow or white light may be used in flashing lamp.
•
Due to additive effect of a gray screen, the test negative will usually have a solid step (1) and too
large a shadow dot.
3-44
