US1484400A - Method of making color plates for use in lithograhy, photo-engraving, etc - Google Patents

Description

Feb; 19 1924. I 1,484,400

E. D. LOUNSBURY ET AL METHOD OF MAKING COLOR PLATES ,FOR USE IN LIYTHOGIRAPHY, PHOTO ENGRAVING, m c

Filed July 26, 1919 Fig.1. 'F Q Z. Prints from Color Separdfibn Ne gah'ves defore Refaudirg yellow Fed Baw. .Blac/fi Same Prizfs affe/Refqaclzing Fz'mbked Prini in Colors 4 Patented Feb. 19, 19 24.

. UNITED STATES PATIENT or FlCE.

EDWIN D. LOUNSBUBY, OF WHITE PLAINS, AND OTTO ZIMMER, OF BROOKLYN,

NEW YORK.

.METHOD OF MAKING COLOR PLATES FOR USE IN LITHOGRAHY, PHOTO-ENGRAV- ING, ETC.

Application filed July 26, 1919, Serial No. 313,646.

To all whom it may concern:

Be it known that we, EDWIN D. LOUNS- BURY, a citizen of the-United States, and a resident of White Plains, county of 6 Westchester, and State of New York, and O'rro ZIMMER, a citizen of the United States, and a resident of the borough of Brookl 11, county of Kings, city and State of ew York, have jointly invented certain new 1 and useful Improvements in Methods of Making Color Plates for Use in Lithography, Photo-Engraving, Etc, of which the following is a specification.

This invention has for its object to provide an improved method of making color plates for use in lithography, photo engraving or any other plate makingv method, and

has for its main object to provide certainmethods by means of which a color sketch, painting, water or oil-color or object may be accurately reproduced in colors; For

this purpose, our invention consists in photographing and making separation negatives of the separate colors of the original color sketch or painting.

' The principle underlying the method of the present invention will be understood. from the following detailed description of the present preferred manner of practicing to this method the various steps being illustrated in the accompanying drawing in which:

Figure 1 is an elevation of a print taken from a separation negative and correspond- :5 ing to the color yellow.

igure 2 is a like View corresponding to the color red.

Figure 3 is a view of the same corresponding to the color blue.

Figure 4 is a like elevation of a print taken from a separation negative corresponding to the color black.

Figure 5 is a view of the print of Figure 1 after retouching.

Figure 6 is a similar view of Figure 2 after retouching.

Figure 7 is a like view of Figure 3 after retouching.

Figure 8 is a similar view of the print of Figure 4 after it has been retouched, and

Figure 9 is "an elevationof the completeprint.

Referring to the drawing, and as an example; say that you have a sketch to be reproduced in four colors, then four sepa- "ration negatives are made. From these negatives photographic prints are then made, as shown in Fi res' 1 to 4;, on porcelain or any hard su ace that can be made.

sensitive so that prints can be'made. If paper prints are made it is important in mounting these prints on cardboard or any,

hard surface as glass or thelike to have all. the prints register accurately with each other and this may be done by pressing the prints by" means of rollers directed all in one and the same direction, so that in all respects the prints are the same or as nearly the same as possible so that the four prints will register accurately with each other. Theartist then takes these prints of Figures 1 to 4, 'retouches each print for the particular color which the prints are 'made, yellow, red, blue and black, as shown in Figures 1 to 4, and he works up theseprints with an-air brush, crayon. pencil or paint, painting out white where necessary, the

general desire of the artist being that-each 4 or copper, or other forms suitable for lithography or photoengraving, and etched in the usual manner to produce the finished work as shown in Figure 9.

The method above described has the great advantage over the old lithographic process heretofore known and practiced because the work is practically finished on the photographic prints and when the prints onstone or metal are made they are then ready for proofing. When ordinary, half-tone separation negatives are made and then rinted on stone or metal, the artist has to ru out tints and scrape away and put in solids and Ben Day work and very often this work will come up again and the tints put on are not always satisfactory. Another advantage is that. we can reduce or enlarge these retouched copies andif necessary can make any size or as manydiflerent sizes as desired. Thus an artist having once provided prints and retouched' them for their particular color, these may be stored away without the investment of any large sum of money. 5 The use of our improved method has given advantageous results and lends itself to certain modifications in connection therewith.

What is claimed is That method of making, color-plates for use in lithography which consists in taking separation negatives and making photographic prints from them, one of each color esired, retouching a separate print for each color desired so that the work may be msaeoo practically finished on the photographic prints, photographing each retouched print I through a half-tone screen to produce a high light half-tone negative for each color, and printing each said last mentioned 20 negative on a sensitized element suitable for photo-engraving.

In testimony that we claim the foregoing as our invention, we have signed-our names in presence of two subscribing witnesses.

1 -EDWIN D LOUNSBURY.

OTTO ZIMMER.

Witnesses: 1

CHARLES NUsBAUM, OLUF HANSEN.

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