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السحب والضباب .. مصدر الضوء .. كيفية التقاط وتطوير الصور الملونة
CLOUDS , MIST & HAZE
Clear , sunny weather is only one of many natural lighting conditions . Clouds and other atmospheric conditions alter the quality of light in two ways : by reflecting sunlight and by diffusing it . There is tremendous variety even in the ways that they do this .
CLOUDS
Clouds act as reflectors in the same way that a sheet of white paper can be used in the studio to lighten shadows . The effect is very noticeable on days with fair weather cumulus - the bright , small , cotton - wool clouds . When the cloud cover is continuous , the reflection helps to kill all shadows . More important , however , is the way in which clouds diffuse the light , spreading the area from which the illumination strikes the subject . At first glance , overcast weather may seem unattractive for photography , giving a flattened , dull look to the landscape . However , this well - diffused light is very good for two things : colour saturation and detail . Because there are no bright reflections from shiny surfaces and no strong shadows , cloudy light gives good , pure colours . Green grass , for instance , actually appears lusher under clouds than in direct sunlight . Objects with complex shapes usually show up more clearly in this soft light .
BELOW Clouds , aside from being dramatic in themselves , result in light that gives good , pure colours . Also , objects with complex shapes show up more clearly in this soft light .
MIST AND FOG
These conditions provide wonderful opportunities for restrained , atmospheric images . They simplify the shapes of things , give a strong sense of distance ( because backgrounds recede into invisibility ) , and limit the tones and colours to a narrow range . The thickness of mist and fog often changes quite quickly , and can clear from an area in minutes , particularly when they have formed early in the morning and need only the warmth of the sun to burn away .
BELOW LEFT Mist and fog are of course ideal should the photographer be in search of atmospheric images . They also help to convey a sense of distance , since backgrounds tend to recede into invisibility .
BELOW A polarizing filter can increase contrast between clouds and a blue sky . Rain is a light diffuser in itself , as this picture of a tropical downpour shows .
HAZE
Haze also increases the sense of distance , by means of aerial perspective . It is due to the scattering of light by small particles in the atmosphere , and because the shorter , ultraviolet wavelengths are the most affected , that distant scenes in haze have a bluish tinge . Film is more sensitive than the eye to ultraviolet , so that the effects appear stronger in a photograph than they do in the real scene . This can be used to advantage as a way of keeping depth in a landscape , but to reduce the appearance of haze , use an ultraviolet filter over the lens ( many photographers keep these clear glass filters fitted permanently a as an additional protection for the front element of the lens ) .
RIGHT Overcast conditions kill shadows and allow the reproduction of detail which may be lost in undiffused sunlight . The depth of this shot would be lost and the scene confused if criss - crossed by shadow .
CLOUDS , MIST & HAZE
Clear , sunny weather is only one of many natural lighting conditions . Clouds and other atmospheric conditions alter the quality of light in two ways : by reflecting sunlight and by diffusing it . There is tremendous variety even in the ways that they do this .
CLOUDS
Clouds act as reflectors in the same way that a sheet of white paper can be used in the studio to lighten shadows . The effect is very noticeable on days with fair weather cumulus - the bright , small , cotton - wool clouds . When the cloud cover is continuous , the reflection helps to kill all shadows . More important , however , is the way in which clouds diffuse the light , spreading the area from which the illumination strikes the subject . At first glance , overcast weather may seem unattractive for photography , giving a flattened , dull look to the landscape . However , this well - diffused light is very good for two things : colour saturation and detail . Because there are no bright reflections from shiny surfaces and no strong shadows , cloudy light gives good , pure colours . Green grass , for instance , actually appears lusher under clouds than in direct sunlight . Objects with complex shapes usually show up more clearly in this soft light .
BELOW Clouds , aside from being dramatic in themselves , result in light that gives good , pure colours . Also , objects with complex shapes show up more clearly in this soft light .
MIST AND FOG
These conditions provide wonderful opportunities for restrained , atmospheric images . They simplify the shapes of things , give a strong sense of distance ( because backgrounds recede into invisibility ) , and limit the tones and colours to a narrow range . The thickness of mist and fog often changes quite quickly , and can clear from an area in minutes , particularly when they have formed early in the morning and need only the warmth of the sun to burn away .
BELOW LEFT Mist and fog are of course ideal should the photographer be in search of atmospheric images . They also help to convey a sense of distance , since backgrounds tend to recede into invisibility .
BELOW A polarizing filter can increase contrast between clouds and a blue sky . Rain is a light diffuser in itself , as this picture of a tropical downpour shows .
HAZE
Haze also increases the sense of distance , by means of aerial perspective . It is due to the scattering of light by small particles in the atmosphere , and because the shorter , ultraviolet wavelengths are the most affected , that distant scenes in haze have a bluish tinge . Film is more sensitive than the eye to ultraviolet , so that the effects appear stronger in a photograph than they do in the real scene . This can be used to advantage as a way of keeping depth in a landscape , but to reduce the appearance of haze , use an ultraviolet filter over the lens ( many photographers keep these clear glass filters fitted permanently a as an additional protection for the front element of the lens ) .
RIGHT Overcast conditions kill shadows and allow the reproduction of detail which may be lost in undiffused sunlight . The depth of this shot would be lost and the scene confused if criss - crossed by shadow .
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