DEAR DICK:

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04747A000700010011-2
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 2
• Document Creation Date: December 28, 2016
• Document Release Date: March 29, 2002
• Sequence Number: 11
• Publication Date: December 12, 1966
• Content Type: LETTER

Approved For Release 2002/06/17 : CIA-RDP78B04747A000700010011-2
December 12, 1966
MW-M-1603
In response to our 21 November technical discussion,
concerning the ability to predictably control the convolution of
transfer functions for a nonlinear photographic system, a study
was conducted on the sensitometric behavior of original negative
material in the GEMS simulation process. As stated in the enclosed
report, the findings indicate that the density range of GEMS will
not be suitable when employing a GEMS master obtained from a 2.3
gamma original negative.
The report also discloses that the best GEMS sensito-
metric simulation obtainable, by employing the existing simulation
techniques, is achieved with the use of an original negative
possessing a processing gamma of unity. The use of unity gamma
negative material does not permit a truly realistic simulation of
mission material because of certain deficiences. If unity gamma
negative material is employed in the simulation process, a notic-
able GEMS contrast improvement would result; but such simulated
material might not satisfy your ultimate photographic parameter
requirements.
We feel that it is necessary to review the tonal simula-
tion process as it applies to the system parameters and to recommend
an appropriate course of action in'the immediate future.
Sincerely,
Declass Review by
NIMA/DOD
Approved For Release 2002/06/17 : CIA-RDP78B04747A000700010011-2
 A roved For Rpipa-se 90011064:1. ~.
MEMORANDUM FOR:
10011-2
STATINTL
STATINTL
STATINTL
(DATE)
STATINTL
I've read the attached and reach the
same conclusions that Bill T. ruched.
We either need a news ocessed material
which is originally p
of unity.
Guess it's back in your lap again. Maybe
the pseudo-GE is a way out for us.
Approved For Release 2002/06/17 : CIA-RDP78BO4747A000700010011-2