تويت
إضاءة رعوية ..
الإضاءة ..
كتاب التصوير الفوتوغرافي المغلق
Grazed lighting
Grazed lighting is when a light source is posi tioned so that the beam strikes the surface of the subject at a very low angle . Low - angled light is particularly effective for revealing de tails of a textured surface , since it highlights only the raised parts though at the same time casting shadows in all the dips and depressions . Grazed lighting is ideal for showing the tex - ture of stonework , basketwork , carpets , fabrics , the sculpturing on seashells and the surface relief of rough bark . The resulting effect can sometimes create a double illusion when one moment the hollows are seen as prominences and at the next glance switch back to appear ing as hollows .
Depending on the magnification scale selected , the light sources used to create grazed lighting in the studio can be spotlights , flashes or even fiber optics . When working out side , a small electronic flash can provide grazed lighting for a close - up at any time of the day . Large photoflood reflectors will not be suitable because they do not produce a narrow glancing beam of light .
When using a continuous light source , the effect of altering the angle of light can be appraised quite easily and often only a minor adjustment can make a striking difference . When using a flash , however , appraisal of the effect can be seen only by using a flash with a built - in modeling light or if a flashlight is taped onto the flash .
Low - angled lighting which skims the surface casts shadows on one side of the raised relief . These shadows will be more consistent in size , shape and intensity if the light source is not placed too close to the subject . An aluminum foil reflector or a mirror positioned opposite the light source can help to reduce the contrast by filling in and easing the dark shadow areas .
Fabric block detail
This is a portion of an Indian silk printing block hand - carved from hard wood . The camera was mounted on a copying stand above the block which was lit by a single spot shining across the carved surface . I wrapped a black paper cone around the light to provide more directional lighting . Wiping the surface with a damp cloth enriched the ink stained carving so that it contrasted with the dusty background . Lens Hasselblad 80mm + 55mm extension Mag . on film × 0.7 Mag . on page × 1.75
Pencil points ▷
I bought five packs of colored pencils and arranged them in five rows with the colors in the same order in each row . Scotch tape was used to hold each set of pencils together and also to bind each row slightly out of register with the adjacent one . I then . made a cardboard box into which the pencils fitted exactly . With the camera set up on an overhead copying stand , I shone a pair of fiber optics across the tips of the pencil points from opposite sides of the box . Lens 55mm micro - Nikkor Mag . on film × 0.5 Mag . on page × 4.8
الإضاءة ..
كتاب التصوير الفوتوغرافي المغلق
Grazed lighting
Grazed lighting is when a light source is posi tioned so that the beam strikes the surface of the subject at a very low angle . Low - angled light is particularly effective for revealing de tails of a textured surface , since it highlights only the raised parts though at the same time casting shadows in all the dips and depressions . Grazed lighting is ideal for showing the tex - ture of stonework , basketwork , carpets , fabrics , the sculpturing on seashells and the surface relief of rough bark . The resulting effect can sometimes create a double illusion when one moment the hollows are seen as prominences and at the next glance switch back to appear ing as hollows .
Depending on the magnification scale selected , the light sources used to create grazed lighting in the studio can be spotlights , flashes or even fiber optics . When working out side , a small electronic flash can provide grazed lighting for a close - up at any time of the day . Large photoflood reflectors will not be suitable because they do not produce a narrow glancing beam of light .
When using a continuous light source , the effect of altering the angle of light can be appraised quite easily and often only a minor adjustment can make a striking difference . When using a flash , however , appraisal of the effect can be seen only by using a flash with a built - in modeling light or if a flashlight is taped onto the flash .
Low - angled lighting which skims the surface casts shadows on one side of the raised relief . These shadows will be more consistent in size , shape and intensity if the light source is not placed too close to the subject . An aluminum foil reflector or a mirror positioned opposite the light source can help to reduce the contrast by filling in and easing the dark shadow areas .
Fabric block detail
This is a portion of an Indian silk printing block hand - carved from hard wood . The camera was mounted on a copying stand above the block which was lit by a single spot shining across the carved surface . I wrapped a black paper cone around the light to provide more directional lighting . Wiping the surface with a damp cloth enriched the ink stained carving so that it contrasted with the dusty background . Lens Hasselblad 80mm + 55mm extension Mag . on film × 0.7 Mag . on page × 1.75
Pencil points ▷
I bought five packs of colored pencils and arranged them in five rows with the colors in the same order in each row . Scotch tape was used to hold each set of pencils together and also to bind each row slightly out of register with the adjacent one . I then . made a cardboard box into which the pencils fitted exactly . With the camera set up on an overhead copying stand , I shone a pair of fiber optics across the tips of the pencil points from opposite sides of the box . Lens 55mm micro - Nikkor Mag . on film × 0.5 Mag . on page × 4.8
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