Andrews, E. C. (Emory Cobb), b. 1878 · Chicago : The Inland printer company · leaf 59
d indicates at all times the relative size of the opening. Say that the reading of the dial is 50. Half of the light has been shut off the standard white in order to make it match in value the sample to be tested. The sample, therefore, has a value of 50. Each of these neutral black and white grays… … Fig. 22. and Fig. 27, page 70, shows the values of 10, 30, 50, 70, and 90 contrasted with each other, forming ten two-value com- binations in two arrangements. The left upper part of the figure shows the darker value surrounded by the lighter, and the right lower part the lighter value surrounded…
Color printing
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