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كتاب التصوير الفوتوغرافي
Tone separation
Tone separation or posterization is a printing process which reduces the usual wide range of tones known as " continuous tone " in a normal image to just three flat tones - black , white and gray . It will create a bold , strong portrait image , but you will have to carry out a great deal of preparatory work before making the final print . First , make a good , full - tone copy of the original negative by contact printing it onto an ordinary negative material such as FP4 or Plus - X . This gives you a master positive from which you can then make the " separation negatives " you will need ( see p . 161 ) . Because you are trying to condense several mid - tones into one , you should make your separation negatives on a very hard negative material such as Kodalith . However , even copying your image onto very hard material is not enough to condense all the mid - tones in one operation , so you must repeat the copying process to get a further three negatives . You print these three final negatives in turn in perfect register on a single piece of printing paper . In order to get accurate registration you must use a register punch . Start with the shadow negative , then print the mid - tone negative and finally the highlight negative . You must make a test strip in each case to ensure that you print a precise tone .
A simpler special printing technique , also involving the use of separations , is " bas - relief " This gives a black and white print a pseudo three - dimensional effect , resembling a bas relief sculpture . You start by making a very thin underexposed ) copy of your original black and white negative . The print is then produced by sandwiching the copy with the original slightly out of register so that some lines become thicker or even double . For best results start by using a thin original .
Bas - relief image This subject suits the treatment particularly well - his craggy face and wild hair gives good scope for the outline . I used Plus - X film to make an under exposed copy of my original negative and then sandwiched the two together , slightly out of register , to make the print . Mamiyaflex C3 , 80 mm , 1/30 sec at f11 , Plus - X .
Using tone separation ▷ The picture above shows the image as it appeared before the tone separation , right . This technique seems to suit both the personality and the work of the abstract artist Victor Pasmore . Mamiyaflex C3 , 65 mm . 1/30 sec at f11 , Plus - X .
تقنيات خاصة ..
كتاب التصوير الفوتوغرافي
Tone separation
Tone separation or posterization is a printing process which reduces the usual wide range of tones known as " continuous tone " in a normal image to just three flat tones - black , white and gray . It will create a bold , strong portrait image , but you will have to carry out a great deal of preparatory work before making the final print . First , make a good , full - tone copy of the original negative by contact printing it onto an ordinary negative material such as FP4 or Plus - X . This gives you a master positive from which you can then make the " separation negatives " you will need ( see p . 161 ) . Because you are trying to condense several mid - tones into one , you should make your separation negatives on a very hard negative material such as Kodalith . However , even copying your image onto very hard material is not enough to condense all the mid - tones in one operation , so you must repeat the copying process to get a further three negatives . You print these three final negatives in turn in perfect register on a single piece of printing paper . In order to get accurate registration you must use a register punch . Start with the shadow negative , then print the mid - tone negative and finally the highlight negative . You must make a test strip in each case to ensure that you print a precise tone .
A simpler special printing technique , also involving the use of separations , is " bas - relief " This gives a black and white print a pseudo three - dimensional effect , resembling a bas relief sculpture . You start by making a very thin underexposed ) copy of your original black and white negative . The print is then produced by sandwiching the copy with the original slightly out of register so that some lines become thicker or even double . For best results start by using a thin original .
Bas - relief image This subject suits the treatment particularly well - his craggy face and wild hair gives good scope for the outline . I used Plus - X film to make an under exposed copy of my original negative and then sandwiched the two together , slightly out of register , to make the print . Mamiyaflex C3 , 80 mm , 1/30 sec at f11 , Plus - X .
Using tone separation ▷ The picture above shows the image as it appeared before the tone separation , right . This technique seems to suit both the personality and the work of the abstract artist Victor Pasmore . Mamiyaflex C3 , 65 mm . 1/30 sec at f11 , Plus - X .
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