الأفلام الملونة السالبة المتعددة الطبقات .. كتاب التصوير الملون ، عبد الفتاح رياض

Subtractive multilayer negative materials

It is one of the species of multi-layered films that we have already talked about its structure (p. 143). After showing it, the image color values ​​are inverted

Reversed tonal Values ​​What was present in the original photographic subject becomes lighter in the negative image, and vice versa.

Hues image color assets are also complementary

The origins of the original colors in nature

D D Blue colors in nature, we find yellow in the negative image. cochineal

and green colours

red

Cyan in the negative.

bile

blue in the negative.

scarlet

green

teal blue

red


It is possible - by printing or enlarging - to use the negative color film after showing it to obtain:

(1) Positive colored photos by printing or enlarging them on colored sensitive paper. (b) Positive black and white photographs, printed or enlarged on paper

Sensitive and black and white.

Color Positive (7) Transparent color positive images printed or enlarged on photosensitive film

(D) Positive, transparent, black and white images printed or enlarged on positive sensitive film, black and white. .


(5) Colored transparent negatives by printing or enlarging them on a color sensitive film. Commonly known as Duplicating Negative (and) transparent black and white negatives by printing or enlarging onto black and white reversal sensitive film. (g) In addition to the foregoing, it is possible to obtain from colored negatives direct separation positives to be used in color printing processes, given what we have already learned about the properties of dyes (which are created in the three layers after colored exposure) that they are It does not have ideal absorption curves (Fig. 48 p. 153), so this defect may be compensated in some types of multilayer negative color films by following any of the following methods: (1)

(a) The color problems carried by the three layers themselves must be colored, and thus they automatically modify what is likely to be sensitive.

That the colors suffer from a lack of color saturation (b) some species may have a layer that acts as a mask

Masking layer