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Shapes of openings in templates used in making positive color-separation transparencies for
Shape of opening in template used in making calibration stepped-density transparency for surveying colors obtainable with
Chromaticities obtained by superimposed proofs of pairs of
Errors of dominant wave-length of a good copy of
Tone distortion curves of components of
Construction of patterns of superimposed pieces of 0.1 density neutral filter-film used in preparing Plate I. The shapes of the pieces were derived from Fig. 3, corresponding to the densities produced by photographing a trial assembly of 0.1 density neutral filter-films. Note the sectional view of the pile of filter-films shown at upper left. The coordinates shown for each pattern correspond to those in Fig. 3. Broken lines indicate the shapes of opaque masks which surrounded each pattern and concealed irregular ends of pieces of filter-film. These patterns were placed on an opal glass illuminated uniformly from the opposite side, and were photographed full size with a simple aperture (pinhole, no lens) having diameter equal to half the width of the widest step in the patterns. The engraved printing plates made from the resulting smoothly graded transparencies were trimmed corresponding to the dotted boundaries shown in the patterns.
Distribution of colors in I.C.I. chromaticity diagram, showing gamut obtainable with a modern commercial process of color printing. The colors are approximately correctly distributed in the diagram when the plate is illuminated with daylight. (Inserts provided by