لمعان قزحي الألوان .. لقطات مقربة إبداعية .. كتاب التصوير الفوتوغرافي المغلق

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  • لمعان قزحي الألوان .. لقطات مقربة إبداعية .. كتاب التصوير الفوتوغرافي المغلق

    لمعان قزحي الألوان ..
    لقطات مقربة إبداعية ..
    كتاب التصوير الفوتوغرافي المغلق

    Iridescent sheens

    Iridescence is the term used to describe the rainbow - like colors which change as they are viewed at different angles to the light . This phenomenon , which is characteristic of inter ference colors , appears in everyday objects such as soap bubbles , oily layers and when heat is applied to polished steel or copper . The iridescent hues seen in these objects range through red , blue , copper , gold , bronze , green , blue and violet . The intensity of the colored hues in a soap bubble depends on the thickness of the soap film around the bubble and the angle at which it is viewed . A beam of light is reflected both from the outer and the inner surface of the film . This results in some of the wavelengths being in phase and therefore intensified , and others being out of phase and therefore cancelled out . As the bubble film thins out , so the colors change .

    In the natural world , most colorations result from pigments produced by the plants from the uptake of minerals or by animals from their diet . Iridescent colors are produced by physical structures within , for example , feathers or scales , which cause light to diffract . Many animals sport iridescent colors , often as a means of attracting a mate . As a peacock struts in front of a peahen with an erect tail fan , the iridescent eye - spots on the feathers ( see p . 66 ) glisten in the changing light . Other examples of iridescent colors in the animal kingdom can be seen in the male Indian jungle fowl ( the ancestor of the domestic chicken ) , sunbirds , neon and cardinal tetras , dragonfly bodies , various metallic - looking beetles - notably the South American gold chafer - the tropical Morpho butterflies and abalone shells . Most splendid of all are the tiny humming birds or " flying jewels ".

    Bird feathers and butterfly wing scales will retain their iridescence long after the animal has died , providing the feathers or the scales . are not damaged . However , the brilliant iridescent colors of the eye of a living horsefly soon begin to fade after the insect dies .
    Photography of iridescent colors admirably illustrates the way in which the direction light strikes a subject can make or mar a close - up .

    Before the bubble bursts
    I mixed glycerine with concentrated household detergent and blew the bubbles onto a piece of glass laid on top of black plastic sheeting . I used four electronic flashes , each directed through a diffusing screen , to capture the rapidly changing interplay of colors on the front face of the bubble . Lens Hasselblad 80mm + 172mm ( 55 + 56 + 32 + 21 + 8 ) extension Mag . on film × 2.5 Mag . on page × 18

    An oily road ▷ I noticed this strange colored patch on the road and took this stunning picture created simply from oil which had spilt on the road's surface . The picture was taken on an overcast day using a Benbo tripod to support the camera . Lens Hasselblad 150mm + 10mm extension Mag . on film × 0,1 Mag . on page × 0.5

    اضغط على الصورة لعرض أكبر. 

الإسم:	مستند جديد ٠٩-١٠-٢٠٢٣ ١٤.٢٠_1.jpg 
مشاهدات:	24 
الحجم:	142.4 كيلوبايت 
الهوية:	168125 اضغط على الصورة لعرض أكبر. 

الإسم:	مستند جديد ٠٩-١٠-٢٠٢٣ ١٤.٢١_1.jpg 
مشاهدات:	17 
الحجم:	145.1 كيلوبايت 
الهوية:	168126 اضغط على الصورة لعرض أكبر. 

الإسم:	مستند جديد ٠٩-١٠-٢٠٢٣ ١٤.٢٢_1.jpg 
مشاهدات:	18 
الحجم:	87.5 كيلوبايت 
الهوية:	168127 اضغط على الصورة لعرض أكبر. 

الإسم:	مستند جديد ٠٩-١٠-٢٠٢٣ ١٤.٢٣_1.jpg 
مشاهدات:	18 
الحجم:	163.1 كيلوبايت 
الهوية:	168128 اضغط على الصورة لعرض أكبر. 

الإسم:	مستند جديد ٠٩-١٠-٢٠٢٣ ١٤.٢٥_1.jpg 
مشاهدات:	18 
الحجم:	152.9 كيلوبايت 
الهوية:	168129

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