. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 50 Clay Fabric and Geotechnical Properties of Sediment Cores the selected zone and depicts the positions where the specific gray level occurs. The selected gray levels are indicated in figure 54 and span the following intervals: 3—63, 64^-79, 80-95, 96-125, 126-175, 176-225, and 226-250. Gray levels 1 and 2 and those above 250 were recorded as essen- tially zero percent and therefore not included in the com- putations (see fig. 54). A total of 3,200
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 50 Clay Fabric and Geotechnical Properties of Sediment Cores the selected zone and depicts the positions where the specific gray level occurs. The selected gray levels are indicated in figure 54 and span the following intervals: 3—63, 64^-79, 80-95, 96-125, 126-175, 176-225, and 226-250. Gray levels 1 and 2 and those above 250 were recorded as essen- tially zero percent and therefore not included in the com- putations (see fig. 54). A total of 3,200,000 picture elements are contained in the image. Each gray level span contains a given number of picture elements and represents a specific percentage of the total image (picture) area. Each of the seven gray zones was assigned a separate color (false color image), and all colors were printed by the Digital Graphics Generator as a composite picture for comparison v/ith each graphic display density slice and for comparison with the original photomicrograph and DIPS image (figs. 52EM, 53, and 63). Data analysis. Two independent analyses were made to determine the total area of the voids and total area of the clay particles as recorded by the DIPS. The first analysis (Case 1) was made by Naval Intelligence Support Center (NISC) personnel using the computer data and estimating the percentage of clay present in each gray level (table 1). The original photomicrograph was compared with each of the selected gray zones (density slice) to estimate the per- centage of clay present. The cumulative curve (fig. 55) was used to determine the percentage of picture elements in each of the selected gray zones. The percentage of clay present in the sample was calculated from the data as follows: The total number of picture elements = 3,200,000 = Total Area of Picture TAP). The total number of clay elements = 1,035,994 = Total Area of the Clay (TAC). TAG 1,035,994X100 ^ Thus: —— = TAP 3,200
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