تكبير السلبية الملونة على ورق حساس ملون ١_a ..كتاب فن التحميض والطبع والتكبير

Third: Enlarging the colored negative on colored sensitive paper

Except for some, it is the same steps for enlarging the image on black and white sensitive paper, while the minor differences are the most important step of color correction. It is preferable in color enlargement to work in complete darkness due to the extreme sensitivity of sensitive paper and the possibility of damage to colored sensitive paper from safety light, in addition to that the safety used in color enlargement is very weak So it is better to omit it. Colored zoom steps: light

<-1 - Preparing the magnifier: These are the same steps for black and white magnification, and the most important difference is the need to adjust the spectral properties (color) of the magnifier light. This can be done by using a special color magnifier, or changing the head of the magnifier with a head dedicated to color magnification, or using colored filters (refer to the chapter on devices and machines).

We will not use the red filter located under the lens, and therefore it is preferable to remove it.

If you are going to use filters, they must be cleaned by blowing and brushing. .

It is preferable to use a Voltage Stabilizer. 2- Preparing acidification devices and solutions: see next under Fourth: Developing colored sensitive paper:

3- Choose the negative

Although some defects of the colored negative can be corrected during enlargement, an excellent image results from an excellent negative, and two elements must be present in the colored negative to make it easier to enlarge and to give a good image. The truth is
29a- Low contrast: Because it is difficult by normal enlargement methods to show all areas of high light, as well as areas of shadows, in a negative with high contrast. You will find that in many cases we have to sacrifice the details of one of the two areas. As for the low contrast image, we easily get details in both regions (note the difference between intensity and contrast). It is also noted that the color image depends mainly on its colors and not on the contrast between dark and light as | In the black and white photo. In order to give an impression of increasing the contrast of the color image, we can use black and white in the composition when photographing (refer to the author's book, Photography, Science and Art).

B - Color saturation: because the enlargement leads to the loss of some color saturation, so we find that the best images are those that we get from saturated negatives. We also find that pastel colors (unsaturated) show color smears easily, unlike saturated colors.

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It is noted that we can fix some of the defects of the negative such as imaging in fluorescent light (neon) or the presence of a strong color tinge on all the negatives, and the highly contrasted negative can be treated (if it is very important) by reducing its contrast by making a sticky positive image on a black and white film. Then we put the colored negative and the black and white positive image adjacent to each other, so that the details of the image match, in the negative holder of the enlarger. When enlarging this double negative, we find that the non-dense areas in the colored negative are offset by dense areas in the black and white positivity, and vice versa. Thus, we can obtain an acceptable variance. This is called a negative that is made on black and white film. With the mask Max.

It is noted that acceptable images can also be obtained from dense negatives that have been overexposed in the camera more than required, by increasing the time
exposure in the magnifier. Negatives of very low density are best thrown into the trash can

- t test sensitive paper:

Resin-Coated There is not much room for testing, as the colored sensitive paper has one medium degree of contrast, and it is all made on a resin or plastic base, and the difference is in the texture of the surface, which may be glossy, or semi-matt. Semi, or coarse Silk, and the second difference is subtle, which is the slight difference between the colors of different brands. Some companies have more colorful and saturated papers, and some give colors that are closer to nature. And the choice is yours, compare the image that was printed on sheets of different brands and choose the one you like best

It is noted that color sensitive paper is very fast and usually faster than most black and white sensitive papers.

Kodak has produced Ektaflex-PCT color sensitive paper with only one size of 8 x 10 inches. This paper is acidified by a single solution activated activator in a device called Kodak Ektaflex Printmaker, but in this book we will focus on ordinary types of colored photosensitive paper of all sizes, which are acidified by familiar acid solutions.

e - Adjust the zoom ratio: such as black and white zoom.

6 - Adjust the focus

: Like black and white zoom.

Exposure: Same as black and white magnification, except for the following differences. A - Do not use the red filter under the lens to adjust the position of the paper
on the base of the magnifier but depends on adjusting the position of the sensitive paper catch while adjusting

focus.

B - Always use the following filters: Violet light filter 2 Kodak wratten Filter No - Heat filter such as 2043 Pittsburgh No.

C - We use colored filters: It is preferable to adjust the exposure using a filter

first as follows:

For crossovers, use the following filters: 50 magenta and 90 magenta

Yellow ( 90 + Som ) .

For add-on amplifiers in which external filters are not used, the amplifier is set to give: 30 red, 60 green, and 75 blue (R30: G60 B75).

D - It is preferable that the negative used for the first enlargement experiments contain all colors, as well as black, white and purple in its degrees

Adjust colors:

From the previous step (using the proposed first filter, we obtained the required exposure time with a specific lens aperture, for example, F8, to a certain enlargement, for example, 8 x 10 inches. Often, by following the previous explanation, we will get a color image with good colors.

However, the image may have a colored smear of a certain color (yellow, for example, and note that the color of the smears appears clear in areas of neutral colors, such as gray, or unsaturated, such as skin color). Here I remind the honorable reader that the color of the rays falling on sensitive paper