تويت
التصوير الفوتوغرافي الحديث
الجزء الأول التقاط الصور في 3 - د
ما هو التصوير المقطعي؟
TAKING PICTURES IN 3 - D and THE ART OF COPYING
Part I Taking Pictures in 3 - D
Ever since the earliest steropticon , man has been interested in reproducing the depth one sees with the natural eyes in forms of graphic reproduction . The stereo camera of today makes the fascinating toy of yesterday a practical form of graphic art .
In this Assignment you will learn about the third dimension and how it can . be reproduced photographically . You will study the basic requirements of a good stereo picture , and learn how to accentuate the stereo effect .
WHAT IS STEREOPHOTOGRAPHY ?
Whenever you look at anything , your impression of roundness , depth and distance stems largely from the fact that you see things with two eyes . If you had only one eye , the feeling of solidity and dimension would all but disappear . A
photograph taken with a " one - eyed " camera retains very little of this feeling of depth . What little there is , is due largely to the fact that we have learned to translate such things as converging lines , relative sizes , and overlapping objects into an impression of distance . This impression , however , is far from complete . A photograph can actually record only two dimensions , height and width . It cannot record the third dimension , depth . As a result , conventional photographs look flat no matter what we try to do to add depth .
Let us see why two - eyed vision helps us to see the third dimension . Actually there is a difference between the images seen by each eye . To prove this to yourself , pick out some prominent object in the room about eight or ten feet away and look at it . You see just one object . Hold up a pencil about a foot or so in front of you between your eyes the object you are looking at . You will notice that when your eyes are focused on the object ten feet away , you see two separate images of the pencil . When you focus your eyes on the pencil so you see just one pencil , there are two images of the object farther away .
Now close one eye and repeat the experiment . This time you will see only one pencil and only one distant object no matter which one you focus on . With the left eye closed , look at the pencil and note its position with respect to the background . Open the left eye and at the same instant close the right . The pencil will appear to shift its position .
You see things differently with the two eyes because each eye sees every object from a different viewpoint . The right eye sees more of the right side of an object , and the left eye sees more of the left side . You can check this matter of viewpoints by looking at a bottle or jar with a printed label extending almost entirely around it . Hold the jar a little distance in front of you and look at it with each eye in turn . With the left eye , you will see more printing around the left side of the jar ( Figure 1 ) , and with the right eye , more around the right side ( Figure 2 ) . When you look at it with both eyes , you will see just as much around both sides as you saw with each eye separately . This is what is known as binocular vision . This is the phenomenon that enables you to appreciate roundness , solidity , depth , distance and separation of planes .
Same jar as seen by left . and right eye individually . Note that more of printing at left of jar is seen with left eye ( Figure 1 ) , and more of printing on right side of jar is seen with right eye ( Figure 2 ) .
The term binocular is used here in its more literal sense to mean two - eyed , bi meaning two and ocular meaning eyed . It should not be confused with the more general usage for the word binoculars , which are really binocular ( two eyed ) telescopes .
The distance between the two eyes of the average person is about 2½ inches . If , therefore , you set up two cameras with their lenses about 2½ inches apart and photograph the jar we were discussing a moment ago , the picture taken by the left camera would show what your left eye saw , and the picture taken by the right camera would show what your right eye saw . If , now , you could arrange these two pictures in some sort of viewing mechanism so that your left eye sees only the left picture and the right eye sees only the right picture , your brain would combine these two pictures into a single picture exactly as it did when you looked at the jar itself . The result would be a startlingly real and solid looking jar .
That is stereo - or stereophotography - whichever you prefer to call it .
Figure 3 A stereo camera designed to take 35mm film .
الجزء الأول التقاط الصور في 3 - د
ما هو التصوير المقطعي؟
TAKING PICTURES IN 3 - D and THE ART OF COPYING
Part I Taking Pictures in 3 - D
Ever since the earliest steropticon , man has been interested in reproducing the depth one sees with the natural eyes in forms of graphic reproduction . The stereo camera of today makes the fascinating toy of yesterday a practical form of graphic art .
In this Assignment you will learn about the third dimension and how it can . be reproduced photographically . You will study the basic requirements of a good stereo picture , and learn how to accentuate the stereo effect .
WHAT IS STEREOPHOTOGRAPHY ?
Whenever you look at anything , your impression of roundness , depth and distance stems largely from the fact that you see things with two eyes . If you had only one eye , the feeling of solidity and dimension would all but disappear . A
photograph taken with a " one - eyed " camera retains very little of this feeling of depth . What little there is , is due largely to the fact that we have learned to translate such things as converging lines , relative sizes , and overlapping objects into an impression of distance . This impression , however , is far from complete . A photograph can actually record only two dimensions , height and width . It cannot record the third dimension , depth . As a result , conventional photographs look flat no matter what we try to do to add depth .
Let us see why two - eyed vision helps us to see the third dimension . Actually there is a difference between the images seen by each eye . To prove this to yourself , pick out some prominent object in the room about eight or ten feet away and look at it . You see just one object . Hold up a pencil about a foot or so in front of you between your eyes the object you are looking at . You will notice that when your eyes are focused on the object ten feet away , you see two separate images of the pencil . When you focus your eyes on the pencil so you see just one pencil , there are two images of the object farther away .
Now close one eye and repeat the experiment . This time you will see only one pencil and only one distant object no matter which one you focus on . With the left eye closed , look at the pencil and note its position with respect to the background . Open the left eye and at the same instant close the right . The pencil will appear to shift its position .
You see things differently with the two eyes because each eye sees every object from a different viewpoint . The right eye sees more of the right side of an object , and the left eye sees more of the left side . You can check this matter of viewpoints by looking at a bottle or jar with a printed label extending almost entirely around it . Hold the jar a little distance in front of you and look at it with each eye in turn . With the left eye , you will see more printing around the left side of the jar ( Figure 1 ) , and with the right eye , more around the right side ( Figure 2 ) . When you look at it with both eyes , you will see just as much around both sides as you saw with each eye separately . This is what is known as binocular vision . This is the phenomenon that enables you to appreciate roundness , solidity , depth , distance and separation of planes .
Same jar as seen by left . and right eye individually . Note that more of printing at left of jar is seen with left eye ( Figure 1 ) , and more of printing on right side of jar is seen with right eye ( Figure 2 ) .
The term binocular is used here in its more literal sense to mean two - eyed , bi meaning two and ocular meaning eyed . It should not be confused with the more general usage for the word binoculars , which are really binocular ( two eyed ) telescopes .
The distance between the two eyes of the average person is about 2½ inches . If , therefore , you set up two cameras with their lenses about 2½ inches apart and photograph the jar we were discussing a moment ago , the picture taken by the left camera would show what your left eye saw , and the picture taken by the right camera would show what your right eye saw . If , now , you could arrange these two pictures in some sort of viewing mechanism so that your left eye sees only the left picture and the right eye sees only the right picture , your brain would combine these two pictures into a single picture exactly as it did when you looked at the jar itself . The result would be a startlingly real and solid looking jar .
That is stereo - or stereophotography - whichever you prefer to call it .
Figure 3 A stereo camera designed to take 35mm film .
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