ترتيب طبقات الورق الحساس الملون .. كتاب التصوير الملون ، الكاتب عبد الفتاح رياض

Arrangement of layers of colored photosensitive paper:

The colored photosensitive paper has three sensitive layers - Integral - tri rack paper, similar to the color films, except that the arrangement of the layers is different in the photosensitive papers than it is in the films, and we summarize the differences as follows (1):

(a) The sensitive paper does not have the yellow filter layer next to the upper sensitive layer of blue rays, which is the filter that absorbs the blue rays that, if it penetrated the two lower sensitive layers, would affect them. The reason for omitting the placement of this filter is due to the fact that the rays emitted by the tungsten lamp in the deceiver have a lower percentage of blue rays than they are in daylight.

Scarlet (b) As long as it was possible to get rid of this yellow filter, it would not hurt at all to adjust the arrangement of the sensitive layers in the colored paper (Fig. 68), so you see that: - 1 - The upper layer is sensitive to red rays, and in it lie the problems of the middle color

On the other hand, factories work to adjust the spectral sensitivity in the paper layers to suit the previous reality.

green

and lower.

e blue

yellow.

There is no doubt that the reader will wonder: What prompted the change in the usual order of layers in color films? In response to that, we say: Because the image of the cyan dye is the largest factor that depends on it in showing the sharpness of the image, therefore it is recommended that the layer sensitive to infrared rays (in which the cyan dye originates) be the scientific layer (Fig. (68) as it is the layer Which suffers very little from Irrediation (unwanted), and if it made the lower layer, it would certainly suffer a lot from the spread of rays as a result of the rays passing through two sensitive layers before it - and this is something that results in a decrease in the sharpness of the image.

Between the paper backing and the lower sensitive layer, there is another layer known as Baryta. It consists of gelatin in which barium sulfate powder is deposited (Fig. 68).

A sensitive piece of infrared, green, and blue rays, a roll of barina, which is from

Barium sulfate precipitated on a gelatin - paper backing.

Figure 68)

A strip fell asleep in the touch paper prepared for color photography