530 
© 
    
   
       
4-color 
printing 
gamut 
O 700 mm 
  
  
Figure 4.--C.I.E. diagram showing printing color gamut limitations 
compared to electronic and visual color displays (adapted from 
Williamson, 1983). 
Film images of each band are photomechanically mosaicked (fig. 5).. Each 
film-mosaicked band is exposed through a halftone screen to produce half- 
tone film negatives for printing. Image film separates are punch regis- 
tered with line/lettering film separates. A color proof is prepared as a 
quality control guide for printing. 
ADJUST CONTROL 
AND PLOT CONTROL 
BASE SHEET AT 
FINAL SCALE 
LBR FILM PAPER PRINTS 7.5 QUAD TRANSFER 
FOR MARKING CONTROL FOR CONTROL CONTROL TO BAND 
SELECTION 5 IMAGES AND MEASURE 
  
  
(M) 3 > 
COLOR PHOTOGRAPHIC 
HALFTONE PROOF 
  
IMAGE OF EACH EACH BAND FILM IMAGE SEPARATION 
BAND ENLARED TO MOSAICKED REGISTERED TO LETTER/ 
FINAL SCALE AND HALFTONED LINE SEPARATION 
Figure 5.--Photomechanical mosaic procedure (Warren, 1980). 
Graphic Arts Electronic Scanning Procedures 
Electronic scanning and digital enlargement of Landsat imagery results in 
significantly improved quality compared to photographic processing. The 
sensitometric conversion from photographic to lithographic reproduction, 
enlargement in the x and y dimensions, and generation of the halftone dot 
structure can be precisely controlled with an electronic scanner. Landsat 
multispectral scanner (MSS) halftone separates can be produced at scales 
as large as 1:250,000. The same procedures apply to the use of thematic 
mapper (TM) imagery for electronic scanning and production of halftone 
image separates at scales as large as 1:100,000. 
212 
  
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