iddlevalue. The middle absorption of Cyanine is behind D, beingequivalent to wave length 570. This absorption does notcoincide with the absorption maximum (wave length 590)which is to be found in the orange. A second method ofascertaining the absorption of a colour tone is to compare itwith the… … Fig. 11. To be able to compare with spectral colours, we mustbe able to view the same isolated and in greater extension,and the instrument fig. 11 has been specially recommendedfor this purpose by Helmholtz. Remove the eyepiece of 46 THREE-COLOUR PHOTOGRAPHY. the telescope of a spectroscope, and…
Color photography · Color printing
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