TECHNICAL BACKGROUND AND RESULTS TO DATE

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04767A000300050020-0
• Release Decision: RIPPUB
• Original Classification: T
• Document Page Count: 5
• Document Creation Date: December 9, 2016
• Document Release Date: July 17, 2000
• Sequence Number: 20
• Content Type: REPORT

The Bi-Color Technique
,filters
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And;thephotointerpreters 'can do. their normal jab.../
Since spectral separation , is provided by'the' red'. and:
green filters, color can be seen if the _two records are projecte
Although ' this. is not complete'. color (the blue record is
all the time
TOP SECRET
pproved.For RW6ase 2002/05/02 CIA-RDP78B04767 0300050020-0
TECHNICAL BACKGROUND AND RESULTS TO DATE
Bicolor is, simply.'spectr'ally:filtered' black and white
photography. The only. difference between bi-,color and normal acquisi-
tion is the use of'a green'filter on one camera, 'Normally, we use red-,
on both forward and 'aft looking cameras..: In the case of bi-color,
e; use a green filter on one'camera',and a red filter on the other to provide
or 'spectral -die crimination...' The green filter need not be used
mechanism on the KH-4BI camera ;Conceptually., then, this technique
To provide bi-color, the. red and green filters are used..
employed. Even: in the 'bi-,color'.mode this produced typical high
highly realistic color can be;produced with some manipulation.
 Approved For elease 2002105XQNSAURB0476Q000300050020-0 -
25XlA':.
CT: -Technical. Background and Results
. . To Date
The records can also be evaluated, as black and whites differences, This may give clues as to the general
composition of objects: The
green rec
d
or
may also show objects
;.which the normal red record does not show,..
The use of the bi-
color records, then, is .optional der pending on the information
desired. In summar
Y, they can be-Used . for any task f
rom normal
pbotointerpretation, to the production of I I
psuedorr
color prints.
Results to Date
25X1 D
2, Bi
l
-co
or has been tested
and satellite (Mission 1102). systemsL
The highlights were. as follows,
~}..~
and were taken with
the red
greed filters; the film from t s
acquisition was evaluated.
b?. NPIC evaluated the film (in particular
the green
'record
LO assess .its ph otointel?pretation use, and
qualit yet
Y e were
.particularly interested. in assessing the impact of the bi-co
take" on the abiht for .
Y'.0 f the
photointer
preter to do his
he results of the NPIG evaluation were reported : in
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e 20.(
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