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Color Integration to gray

The importance in operations is that if it becomes available in about 1938, two researchers at Kodak Laboratories in England, Pitt and Solwyn, proved a detection that was on a large part of the color print and magnification that came later, and the results they reached decide that if you mix the spectral color groups that make up most of the The usual external scenes, completely mixed with each other, will lead to a neutral or very close to neutral color, which may be white or gray. This phenomenon is known as integration into gray. In the field of color printing and enlargement, we can take advantage of this phenomenon by saying: We know the amount of each of the red, green and blue rays that guarantee us to obtain a good positive image of course or enlargement from a standard negative image, it is possible to use the same ratios of red and green rays And blue to obtain positive images is also good from any other negative origin, because both the standard and last negatives that need to be enlarged will agree in their neutral or close to neutral color if it is possible to mix the color of each of them to be integrated towards gray. It is clear that it is not from It is necessary that the exposure time of the two images agree. However, the stability of the ratio between the colors of the previous rays (red, green, and blue) guarantees obtaining positive colored images with correct exposure. In support of the idea of ​​integration towards gray, we mention that if we make the magnifying lens in a position that allows the image to be completely out of focus, so that it blends We mixed the colors of the image completely, then we exposed the exposure on colored sensitive paper, and it is very expected that we will find the image after exposure and its colors seemed completely gray or close to gray, and it may have been from the above.

(1) Jack H. Coote. Color Prints, revised edition, p. 188.