why photographers use umbrella to cover the light when shooting?

Answer 1

There are a couple different ways of shooting using an umbrella. If you see the light on a stand, facing away from the subject, the light is being bounced off the inner surface of the umbrella. The surface can be white to soften the light, or shiny gold or silver to give some sparkle to the highlights.

There's also a portable "umbrella" that can go over a camera's flash. The light shines through it for a softer look, leaving the shadows less harsh.

Answer 2

An umbrella is a light modifier which as others pointed out is used to soften or diffuse the light as well as disperse it out over a wide area. Personally I don't like umbrellas so much as I prefer to use softboxes. It does pretty much the same job of diffusing and disersing light over a wide area. As to why it is used, well have you ever seen a photo of someone taken outdoors at high noon when the sun is right over the top of their heads? This is a very hard light, and can make some unflattering portraits with blasted out highlights, and incredibly dark shadows. Now on the other hand have you seen or taken a photo of someone on a slightly cloudy or overcast day? The light is soft and hence makes for softer looking portraits or images. An umbrella or a softbox for that matter does pretty much the same job as say clouds, they serve to soften,diffuse and disperse hard light.

Answer 3

Photographers use umbrella to control different lightings and corrections the Aperture, Shutter Speed,and Film Speed,which given best qualities of the pictures that have taken.

Answer 4

The umbrellas don't cover the lights, they direct it.

Answer 5

It doesn't cover the light so much as defuse it. It softens the shadows, makes the light "kinder."
Bright light shows up more imperfections in portraits.
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Answer 6

so that each picture didnt show total bright which would distort the coloring, it cast a shadow just lightly to bring out the image that the photographer was aiming for.