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The processing sequence
Processing turns the latent image in the layers of the exposed film into images in complementary colored dyes , as shown below . The yellow filter layer , shown on page 144 , becomes colorless during pro- cessing and so is not shown here .
Slide films should be given reversal pro- cessing , forming a positive image directly on the film . Color negative processing is shorter and gives a negative image which should be printed on to color photographic paper . The paper follows a similar , but still shorter pro- cessing sequence . Slide film can be pro- cessed as negative film for special effects ; but negative film given reversal processing produces no image .
Reversal slide development
First development
The first solution in slide pro- cessing is a black and white developer , which forms black and white negatives in each layer , corresponding to the latent images . The timing of this stage can be altered to allow for up- or downrated film .
Fogging and color development
After the first development and wash , the film is put in a re- versal solution . This fogs the unexposed areas , rather like fogging by light . The next solution color developer- changes the fogged areas into complementary colored dyes and black silver , producing a positive image .
Bleach
The bleach removes the black silver from all parts of the emulsions , without affecting any of the dyes . Fixing and washing remove the by- products , leaving positive com- plementary colored images in the dyes alone .
The subject
The three primary colors on the toy train , left , are separately . recorded in the film in the three layers . Yellow ( red and green ) produces a response in the red and green layers of the film . White produces an equal response in all three layers ( not shown here ) .
Color negative development
Masking in color negatives
Both the magenta and cyan layers in color film and paper absorb some wavelengths they are intended to transmit . This is most serious in negative film because each dye is formed twice in the film and then in the print . It is overcome by making the magenta layer yellowish and the cyan layer pink wherever their dyes are t not formed . As a result color negatives have an orange cast . but this does not appear on the final print .
Color development
In the first stage . a color de- veloper forms black silver and complementary dye images corresponding to the latent negative images in each emul- sion layer a different dye for each layer . The development time should not be adjusted for up- or downrated film as this affects the color too .
Bleach
A metallic bleach removes the black silver parts of the image . and fixing and washing leaves a negative dye image in com plementary colors and opposite tones to the original subject . The negative is suitable for printing on to color paper .
The processing sequence
Processing turns the latent image in the layers of the exposed film into images in complementary colored dyes , as shown below . The yellow filter layer , shown on page 144 , becomes colorless during pro- cessing and so is not shown here .
Slide films should be given reversal pro- cessing , forming a positive image directly on the film . Color negative processing is shorter and gives a negative image which should be printed on to color photographic paper . The paper follows a similar , but still shorter pro- cessing sequence . Slide film can be pro- cessed as negative film for special effects ; but negative film given reversal processing produces no image .
Reversal slide development
First development
The first solution in slide pro- cessing is a black and white developer , which forms black and white negatives in each layer , corresponding to the latent images . The timing of this stage can be altered to allow for up- or downrated film .
Fogging and color development
After the first development and wash , the film is put in a re- versal solution . This fogs the unexposed areas , rather like fogging by light . The next solution color developer- changes the fogged areas into complementary colored dyes and black silver , producing a positive image .
Bleach
The bleach removes the black silver from all parts of the emulsions , without affecting any of the dyes . Fixing and washing remove the by- products , leaving positive com- plementary colored images in the dyes alone .
The subject
The three primary colors on the toy train , left , are separately . recorded in the film in the three layers . Yellow ( red and green ) produces a response in the red and green layers of the film . White produces an equal response in all three layers ( not shown here ) .
Color negative development
Masking in color negatives
Both the magenta and cyan layers in color film and paper absorb some wavelengths they are intended to transmit . This is most serious in negative film because each dye is formed twice in the film and then in the print . It is overcome by making the magenta layer yellowish and the cyan layer pink wherever their dyes are t not formed . As a result color negatives have an orange cast . but this does not appear on the final print .
Color development
In the first stage . a color de- veloper forms black silver and complementary dye images corresponding to the latent negative images in each emul- sion layer a different dye for each layer . The development time should not be adjusted for up- or downrated film as this affects the color too .
Bleach
A metallic bleach removes the black silver parts of the image . and fixing and washing leaves a negative dye image in com plementary colors and opposite tones to the original subject . The negative is suitable for printing on to color paper .
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