Andrews, E. C. (Emory Cobb), b. 1878 · Chicago : The Inland printer company · leaf 57
COLOR AND ITS APPLICATION TO PRINTING. value in the other values according to relative proportion. Thus a 60-value gray would have a relative proportion of 60 of white to 40 of black ; but if it takes 40 parts by weight of white to balance 1 part by weight of black, and produce middle value, a… … Fig. 20. front view. the printed impression of the 60-value gray may vary as much as five per cent, so that the only accurate way of pro- ducing a scale such as shown in Fig. 19 is to test each sepa- rate sample with a photometer. Mr. A. H. Munsell has pro- duced a satisfactory photometer for this…
Color printing
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