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The American annual of photography . CANON OF THE RIO DE LAS ANIMAS PERDIDAS.Southwestern Colorado. GEORGE L. BEAM. A Mosaic color screen, A special panchromatic emulsion. A special yellow filter. They differ somewhat from the above description in thatthe Paget and Dufay employ a geometric recurring pattern ofMosaic screen (Figures i and 2), while the Lumiere is ofan irregular non-recurring pattern (Figure 3).. Figure i. Photomicrograph of Paget taking screen {duplicating process) red, green andblue rectangles approximately 1/500 square. Also the emulsion is coated directly over the Mosaic scr

The American annual of photography . CANON OF THE RIO DE LAS ANIMAS PERDIDAS.Southwestern Colorado. GEORGE L. BEAM. A Mosaic color screen, A special panchromatic emulsion. A special yellow filter. They differ somewhat from the above description in thatthe Paget and Dufay employ a geometric recurring pattern ofMosaic screen (Figures i and 2), while the Lumiere is ofan irregular non-recurring pattern (Figure 3).. Figure i. Photomicrograph of Paget taking screen {duplicating process) red, green andblue rectangles approximately 1/500 square. Also the emulsion is coated directly over the Mosaic scr Stock Photo
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Contributor:

The Reading Room / Alamy Stock Photo

Image ID:

2ANEWH7

File size:

7.2 MB (337.3 KB Compressed download)

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Dimensions:

1581 x 1581 px | 26.8 x 26.8 cm | 10.5 x 10.5 inches | 150dpi

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This image is a public domain image, which means either that copyright has expired in the image or the copyright holder has waived their copyright. Alamy charges you a fee for access to the high resolution copy of the image.

This image could have imperfections as it’s either historical or reportage.

The American annual of photography . CANON OF THE RIO DE LAS ANIMAS PERDIDAS.Southwestern Colorado. GEORGE L. BEAM. A Mosaic color screen, A special panchromatic emulsion. A special yellow filter. They differ somewhat from the above description in thatthe Paget and Dufay employ a geometric recurring pattern ofMosaic screen (Figures i and 2), while the Lumiere is ofan irregular non-recurring pattern (Figure 3).. Figure i. Photomicrograph of Paget taking screen {duplicating process) red, green andblue rectangles approximately 1/500 square. Also the emulsion is coated directly over the Mosaic screeninstead of being on a separate plate, although the Pagetpeople make a duplicating process which necessitates theMosaic screen and panchromatic plate being separate. It is obvious in the latter method that the Mosaic screenmust be of a regular geometric pattern, otherwise it wouldbe practically impossible to affect the final registration. This is not necessary in the combined screen and plateprocess, for no registration is required, the negative emulsionbeing reversed to form a positive. This is accomplished byeliminating the fixing of the negative, and by placing the plateafter development in a solution of bichromate or perman-ganate of potash where the exposed silver in its reduced 124 metallic form is dissolved out, leaving those portions of theplate transparent.

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