BICOLOR

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04767A000400050009-2
• Release Decision: RIPPUB
• Original Classification: T
• Document Page Count: 4
• Document Creation Date: December 28, 2016
• Document Release Date: April 12, 2002
• Sequence Number: 9
• Content Type: PAPER

W SECRET
Approved P
or Relea 2002/06/17: CIA-Rq
1. Selected passes on Mission Ilare'exposed on black and white
subject to the limitations stated above, are indicated by the letters "BC"
in the photo reference line immediately following the pass number.
image(s) to the extent that bicolor cannot be created. Those passes exposed
in the bi-spectral mode which possess the potential for bicolor creation
in register, onto a common surface. LimiA;irig factors such as atmospheric
conditions, exposure, and reproduction characteristics may degrade the
both cameras must be rectified and projected through filters (red and green),
To create bicolor imagery, the images on the black and white positives from
information, the photography can be viewed in a color mode referred to az.
"bicolor", a psuedo color generated from only two colors of the spectrum.
film in the bi-spectral mode of acquisition, utilizing a. red fflter an, ;ce
'forward camera and a green filter on the aft camera. The density of tie
.images on the black and white photography acquired is related to the. fli ters
through which they were exposed. To facilitate the readout of bi-spectr...l
2. Information contained in this report on targets imaged on the passes
`'exploitation of the bi-spectral data will be implemented at a;later date
white positives, utilizing techniques similar to previous KH-4 missions.
exposed to bi-spectral mode is developed from viewing only the black and
during the third phase exploitation of selected targets.
!1%/C
s _ ~ , . `?: ~:, .. ~ ? t ..'; ~ , ~x , rte:
Declass Review by NIMA / DoD
GROUP I
Exctadad from automatic
downgrading and
decI UIcaITon
Approved For Release '2002/06/17: CIA-R
.. TOP SECRET.
ORM i"& PAPER
p7A0004050009-2
25X1
25X1
25X1
25X1
 ILLEGIB
Approved For Release 2002/06/17 : CIA-RDP78BO4767A000400050009-2
Several passe -F' NT i
in the h -Snectral
25X1
I
mode of acquisition. Bi-s=pectral coverage refers to a technique i
of acquiring conjugate imagery with two came::-as each using a filter ILLEGIB
which has its -ak transmission near opposite ends of the visible
spectrum. In this case, a red filter was used on the f-wig' camera
_ad. a green on the .a.ftt In acquiring -photography in t'r_ .s manner,
the density of images on the black and white records is related to
the filters through which t]. ey were imposed.
To exploit the advantages of bi-spectral photography, the
two b4lck and white records can be analyzed, individually with
respect to the colors which: the density represents. I.E., objects
on the fwd (red filter) record which appear relatively light (low
density) on the DP compared to the sap.., image on the aft (green
filter) record can be assumed to be reflecting in the red end of
th._. spectrum. However, these conclusions cannot be accepted
as L~bsolute. The angle of the sun relative to the taking lens,
atmospheric attenuation, e:---.)sure, and reproduction characteristics
must also be considered. Even under o-_,ti mum conditions, the
color of an object can only be estahlished as being warm (red or
near red) or cool (green or toward the blue end of the spectrum).
In order to facie-.Late the reahout of bi-spectral information,
the photography can be viewed in a color mode referred to as
"bicolor." Bicolor is a -rsuedo color generated from two colors of
Approved For Release 2002/06/17 : CIA-RDP78BO4767A000400050009-2
 Approved For R ase 2002/06/17 : CIA-RDP78B04767 0400050009-2
-c = -e ctrLLr,, i-nsteaa of .-.., t r .: _ as =_s =!Oc:es saif r or' 'natuiaa su
color. 1 order to create of co_;:
records from both
rojecteQ o^_to a co..mon . .:rfac r "tee arOu,gh .! ,rs
.~:0_...~c:_ciJl'e to oSe used in i,.''_c-~---.~ ti1,T:. "u.C,rO-Jr?:-
en, , Iii oon a:'Ta. ab -I e by t pis tec(Iue
S _73.... in scope d ,,a-.'c rro : G gained from -the pi-
_ records vwc . ea l.{ _ yen" y the -o i-c gec"- a
Y1fomna ion - eac__-- r a~ J rent and F. waster readout iS
7~_e. o,--- w t" o.nes ipear :i^ca oa some x_ i cn
:exec Green or cool tones w 1= eco i, ay ee_..
J C '
Tho i ohlem of ~. he cicolor method of exolo" tati_on
eS in'..at be p ^o'~ riatedy `'i_tered and pro ec"Ued
t e rec-,i ied in order to e success -ly registered over
~.xeas larger t~Zan apo oxi--aately 0.1 x 0.1 ..:_
~- currently p_ c _ `d to -p??-Du u.ce co nor p. is fraa
the hi-spectral imagery c_ a ".,rodaction basis for the Conmun.ity.
Approved For Release 2002/06/17 : CIA-RDP78BO4767A000400050009-2
ILLEGIB
ILLEGIB
:2 ,rIore11 c j are
 Approved For Release 2002/06/17 : CIA-RDP78B04767A000400050009-2
25X1
-MEMORANDUM FOR:
(DATE)
US 10-101
FORM I AUGN 54 to' WHICH RELACE$ FORM
ED.
Approved For Release 2002/06/17 : CIA-RDP78B04767A000400050009-2