CN106027883A - Acquiring method for image information recorded by photographic silver salt black-and-white photograph with polluted and damaged surface - Google Patents

Abstract

The invention discloses a method for obtaining image information recorded in black-and-white photographs of photosensitive silver salts damaged by surface pollution. The surface of the black-and-white photo is completely wetted, and the image recorded in the photo appears. After 2 to 3 minutes, take a photo with a digital camera to obtain the recorded image information. Alcohol, isobutanol or tert-butanol volatilize naturally, and the photo can be restored to the state before it appeared. The method of the invention can effectively obtain image information recorded in photosensitive silver salt black-and-white photos such as damaged surface protection layer, bonded pollutants, water immersion stains, bonded paper fibers, mildew, etc., and has simple operation, low cost and strong reprocessability , without destroying the photo.

Description

Method for obtaining image information recorded in photosensitive silver salt black-and-white photo of surface pollution damage

technical field

The invention belongs to the technical field of file restoration and protection, and in particular relates to a method for obtaining image information recorded in a photosensitive silver salt black and white photo file with damaged emulsion layer surface protection layer, bonded pollutants, bonded paper fibers, and mildew.

Background technique

In the vast historical and cultural heritage, black and white photo archives are one of its important components. Photosensitive silver salt black and white photo archives, as a special image archive, have very important historical and cultural value, scientific research value and collection value. Compared with text files, photo files have the characteristics of rich and authentic storage information, and no text files can replace the historical and cultural information recorded in them. However, due to the deterioration of the composition materials of the photos themselves and the influence of the preservation environment, many black-and-white photo archives have suffered from various degrees of disease. Mildew in the emulsion layer of black-and-white photos, silver mirror phenomenon, loose powdering of gelatin in the emulsion layer, bonding of paper fibers, water-soaked stains, etc. lead to blurring and fading of black-and-white photo files, making images unrecognizable, and even causing the images recorded in photos to disappear completely. Its preservation and access have caused extremely adverse effects. Therefore, finding a method that can reproduce the historical original appearance of black and white photo archive information is of great significance for the extension of archive life, copy copy and digital processing. Li Yuhu and others have invented using banana water as a solvent to combine ethyl cellulose, nano silicon dioxide, bis(1,2,2,6,6-pentamethyl-4-piperidinyl)-sebacate, Black-and-white photo display strengthening agent compounded by phenylenedioctyl phosphate and vinylidene fluoride-chlorotrifluoroethylene copolymer, which can show the original appearance of severely blurred and faded black-and-white photos, effectively enhance the mechanical strength of photos, and benefit The long-term preservation of photo archives, but the photos restored by this method need to undergo special processing technology to restore the state before restoration, and the reprocessing is relatively poor.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method with simple operation, low cost and without changing the original appearance of the photo to obtain the image information recorded in the photosensitive silver salt black-and-white photo with surface pollution and damage.

The technical solution adopted to solve the above technical problems is: uniformly apply any one of n-butanol, isobutanol and tert-butanol on the surface of the surface pollution damaged photosensitive silver salt black and white photo that needs to obtain image information, so that the photo The surface is completely wetted, and after 2 to 3 minutes, take a picture with a digital camera to obtain the recorded image information.

The present invention first uses n-butanol, isobutanol or tert-butanol to coat and display images recorded in photos, and then uses a digital camera to take pictures to obtain the recorded image information. The method of the invention is applicable to the acquisition of image information recorded in black-and-white photos with damaged surface protection layers, bonded pollutants, water-soaked stains, bonded paper fibers, and mildew. When n-butanol, isobutanol or tert-butanol volatilize naturally, the photo can be restored to the state before it appeared, and it can be reprocessed without damaging the photo.

Description of drawings

Figure 1 is a black and white photo after water immersion and disinfectant corrosion.

Fig. 2 is a picture of the photo in Fig. 1 after being developed by n-butanol.

Figure 3 is a black and white photograph of surface bonded paper.

Fig. 4 is a picture of the photo in Fig. 3 after developing with n-butanol.

Figure 5 is a black and white photo of the surface with contaminants and paper fibers bonded.

Figure 6 is a photograph of the photograph in Figure 5 after development with isobutanol.

Figure 7 is a black and white photograph of surface bonded paper and mildew.

Figure 8 is a photograph of the photograph in Figure 7 after visualization with tert-butanol.

Figure 9 is an infrared test chart of black and white photos before and after coating n-butanol.

detailed description

The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments, but the protection scope of the present invention is not limited to these embodiments.

Example 1

Spread the black-and-white photos (see Figure 1) that have been soaked in water and corroded by disinfectant solution on a piece of clean rice paper. It is evenly coated on the surface of the photo, so that the surface of the photo is completely wetted, left for 2 to 3 minutes, and taken with a digital camera under natural light (see Figure 2). As can be seen from Figure 2, most of the disappeared images on the photo are If it is displayed, you can obtain the recorded image information. After shooting, place the photo in a fume hood to completely volatilize the n-butanol adsorbed on the surface of the photo, and the photo can be restored to the state before it appeared.

Example 2

Spread the black-and-white photo (see Figure 3) with the paper bonded on the surface on a piece of clean rice paper, use a soft brush to remove dust and other pollutants adsorbed on the surface of the photo, dip a cotton ball into n-butanol, and apply it evenly Spread it on the surface of the photo, make the surface of the photo completely wet, leave it for 2 to 3 minutes, and take a picture with a digital camera under natural light (see Figure 4). As can be seen from Figure 4, most of the disappeared images on the photo appear again , you can get the recorded image information. After shooting, place the photo in a fume hood to completely volatilize the n-butanol adsorbed on the surface of the photo, and the photo can be restored to the state before it appeared.

Example 3

Spread the black-and-white photos with pollutants and paper fibers on the surface (see Figure 5) on a piece of clean rice paper, use a soft brush to remove dust and other pollutants adsorbed on the surface of the photos, and use a cotton ball to dip in isobutanol , spread it evenly on the surface of the photo to make the surface of the photo completely wet, and after standing for 2 to 3 minutes, use a digital camera to take pictures under natural light (see Figure 6). As can be seen from Figure 6, most of the photos disappear The image of the image appears again, and the recorded image information can be obtained. After the shooting is completed, place the photo in a fume hood to completely volatilize the isobutanol adsorbed on the surface of the photo, and the photo will return to the state before it appeared.

Example 4

Spread the black-and-white photos (see Figure 7) with adhesive paper and mildew on a piece of clean rice paper, use a soft brush to remove dust and other pollutants adsorbed on the surface of the photos, dip a cotton ball into tert-butanol, and It is evenly coated on the surface of the photo, so that the surface of the photo is completely wetted. After standing for 2 to 3 minutes, a digital camera is used to take a picture of it under natural light (see Figure 8). As can be seen from Figure 8, most of the disappeared images on the photo It is displayed again, and the recorded image information can be obtained. After shooting, place the photo in a fume hood to completely volatilize the tert-butanol adsorbed on the surface of the photo, and the photo will return to the state before it appeared.

In order to prove that the photo will not be damaged after the image information is obtained by the method of the present invention, the inventor has carried out a large number of laboratory research tests, and the specific test conditions are as follows:

1. The effect of n-butanol on the mechanical strength of black and white photos

Take the black-and-white photo samples and divide them into two groups, one is the blank group (i.e. without any treatment), the other is the experimental group, soak the experimental group in n-butanol for 24 hours, and after drying, carry out the following tests on the two groups respectively :

①Determination of folding endurance: Cut the sample into 150mm×15mm, with no less than 10 pieces vertically and horizontally, and balance it for three days in an environment with a temperature of 14-20°C and a relative humidity of about 60%. Under the above conditions, adjust the tension of the computer measurement and control folding endurance instrument to 14.7N, measure the folding endurance of the samples, measure 10 samples in parallel for each group of samples, record the double folding times of the samples, and take the average value to obtain the folding endurance of the samples. See Table 1.

Table 1 The influence of n-butanol immersion for 24 hours on the folding endurance of black and white photos

② Determination of tearing degree: cut the sample into 63mm×63mm, cut out vertically and horizontally, no less than 10 pieces (one layer per group is tested), in an environment with a temperature of 14-20°C and a relative humidity of about 60%. Equilibrate for three days. Use the DC-SLY13K computer-controlled tearing tester to measure the tearing degree of the sample. Each group of samples is measured 10 times in parallel, and the average value is taken to obtain the tearing degree of the sample. The calculation formula is:

$\mathrm{<span\; class="notranslate">\; a</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; S</span>}\mathrm{<span\; class="notranslate">\; P</span>}}{\mathrm{<span\; class="notranslate">\; no</span>}}$

Among them, a—tearing degree, mN (gf); S—in the test direction, the average scale reading; P—conversion factor, that is, the number of design layers of the scale; n—the number of layers of the sample torn at the same time. The number of layers designed for the scale in this experiment is consistent with the number of layers of the sample torn at the same time, so the measured tearing degree is equal to the average scale reading in the test direction. The measurement results are shown in Table 2.

Table 2 The effect of n-butanol immersion for 24 hours on the tearing degree of black and white photos

From the folding endurance test data in Table 2, it can be seen that the folding endurance of the black-and-white photos soaked in n-butanol for 24 hours has increased, indicating that n-butanol not only did not decrease the folding endurance of the photos, but actually improved them. Tear test data show that n-butanol has little effect on tearing of black and white photographs. Therefore, the present invention uses n-butanol to develop black and white photographs without reducing the mechanical strength of the photographs.

2. The effect of n-butanol on the size of black and white photos

Use a pencil to draw two lines representing the length and width of the photo on the black and white photo and measure the size, then soak in n-butanol for 24 hours, measure the size of the photo after drying, and compare the size change of the photo before and after n-butanol treatment . The results are shown in Table 3.

Table 3 The effect of n-butanol immersion for 24 hours on the size of black and white photos

By measuring the size of the photo before and after immersion in n-butanol, it can be seen that n-butanol has no effect on the size of the photo. Therefore, the present invention uses n-butanol to develop black-and-white photos without causing damages such as shrinkage and deformation of the photos.

3. The effect of n-butanol on the color of black and white photos

(1) Use WGG-60 microcomputer gloss meter to test the gloss change of black and white photos before and after n-butanol treatment

Take a black-and-white photo sample, divide it into no less than 5 fixed square areas with a pencil line, use a WGG-60 microcomputer gloss meter to measure the glossiness of each area of the sample, then soak it in n-butanol for 24 hours, and let it dry Then measure the glossiness of each area of the sample after treatment, and compare the changes in the glossiness of the photos before and after n-butanol treatment. The results are shown in Table 4.

Table 4 The influence of n-butanol immersion for 24 hours on the glossiness of black and white photos

As can be seen from the data in Table 4, the difference in gloss before and after immersion in n-butanol is less than the range recognized by the naked eye, indicating that the present invention uses n-butanol to display black and white photos without causing changes in the gloss of the photos.

(2) Use an automatic colorimeter to test the color difference of black and white photos before and after n-butanol treatment

Take a black and white photo sample, test and record the color difference data, then soak it in n-butanol for 24 hours, after drying, measure the color difference after treatment, and compare the changes in the color difference of the photos before and after n-butanol treatment. The results are shown in Table 5.

Table 5 The influence of n-butanol immersion for 24 hours on the color difference of black and white photos

From the measurement data of the color difference of black and white photos before and after n-butanol immersion, it can be seen that the color difference values of black and white photos before and after n-butanol immersion are all less than 1.5, which cannot be recognized by the naked eye, indicating that the present invention uses n-butanol to display black and white photos without causing color difference.

4. The effect of n-butanol on the material structure of black and white photo materials

Bruker Fourier transform infrared Vertex70 was used to test the material structure changes of black and white photo materials before and after n-butanol treatment, and the results are shown in Figure 9. According to the infrared test spectrum analysis before and after coating the black-and-white photo with n-butanol, the positions of the peaks in the infrared spectrum are basically the same, indicating that the coating with n-butanol will not affect the chemical composition of the black-and-white photo material. Therefore, the present invention uses n-butanol to develop black and white photos without changing the material structure of black and white photo materials.

Claims (1)

1. an acquisition methods for image information recorded by surface contamination impaired photosensitive silver black-and-white photograph, and its feature exists In: any one in n-butyl alcohol, isobutanol, the tert-butyl alcohol is spread evenly across the surface dirt that need to obtain image information Contaminate impaired photosensitive silver black-and-white photograph surface, make picture surface complete wetting, with digital camera to it after 2～3 minutes Take pictures, its image information recorded can be obtained.