نشأة المسحة السيان ( الزرقاء المخضرة ) وعلاجها .. كتاب التصوير الملون

The origin and treatment of cyan cast

For an explanation of how this smear is formed in the positive image, we will assume that it resulted from a decrease in the density of the cyan layer in the negative image, which results in an increase in the percentage of red rays that reach the positive photosensitive paper, which in turn affects the red-sensitive layer in the photosensitive paper, which is The layer that bears the cyan color problems:

Cyan color formers

It is evident from the previous explanation that the appropriate treatment in this case is to place a cyan filter in the path of the rays emitted by the light source, so that the degree of density of this filter is appropriate to the intensity of the color of the smear covering the positive image and in the colored plates, as an explanation for the above.

Composite swabs. Composite casts

As we mentioned before, the smear may be simple cast, i.e. its color is yellow - or scarlet - or cyan, and it is | The smears that result from an increase in the density of one of the colored sensitive paper layers over the other two layers.

D The smear may also be composite, that is, it resulted from increasing the density of two layers of sensitive layers with colored paper. And here the color of the smear is: Red: if the density of the two layers that bear the yellow and scarlet color problems increases. Green: Blue. D D

Yellow and cyan

scarlet and cyan

And if we have seen that removing the simple smear from the positive image necessitates that we place in the path of the rays of the enlarger or the printing device only one filter, it may be
: yellow and cyan. If it is yellow, crimson, or cyan - according to the color of the swab, it is necessary to remove the combined smear by using two filters together. The red smear: requires two filters: scarlet and yellow, and the green smear: and the blue smear: e: scarlet and cyan. It is not necessary to remove the combined swab that the two filters have the same degree of density, rather one of them may be more dense than the other. This is because the composite smear may be more inclined to a certain color than its components, for example the composite smear may be red, similar to yellowing, and here it is necessary when correcting the colors of the following image that the density of the yellow filter is slightly greater than the density of

The scarlet filter.

Or the blue smear tends to be crimson, which calls for an increase in the density of the formic filter over the density of its fellow candidate «Cyan». D