2008年11月9日星期日

Film


History
Main article: History of film
Preceding film by thousands of years, plays and dances had elements common to film, scripts, sets, costumes, production, direction, actors, audiences, storyboards, and scores. Much terminology later used in film theory and criticism applied, such as mise en scene (roughly, the entire visual picture at any one time). Moving visual and aural images were not recorded for replaying as in film.
Near the year 1600, the camera obscura was perfected by della Porta. Light is inverted through a small hole or lens from outside, and projected onto a surface or screen, creating a moving image, but it is not preserved in a recording.
In the 1860s, mechanisms for producing artificially created, two-dimensional images in motion were demonstrated with devices such as the zoetrope and the praxinoscope. These machines were outgrowths of simple optical devices (such as magic lanterns) and would display sequences of still pictures at sufficient speed for the images on the pictures to appear to be moving, a phenomenon called persistence of vision. Naturally the images needed to be carefully designed to achieve the desired effect, and the underlying principle became the basis for the development of film animation.

A frame from Roundhay Garden Scene, the world's earliest film, by Louis Le Prince, 1888
With the development of celluloid film for still photography, it became possible to directly capture objects in motion in real time. Early versions of the technology sometimes required a person to look into a viewing machine to see the pictures which were separate paper prints attached to a drum turned by a handcrank. The pictures were shown at a variable speed of about 5 to 10 pictures per second, depending on how rapidly the crank was turned. Some of these machines were coin operated. By the 1880s the development of the motion picture camera allowed the individual component images to be captured and stored on a single reel, and led quickly to the development of a motion picture projector to shine light through the processed and printed film and magnify these "moving picture shows" onto a screen for an entire audience. These reels, so exhibited, came to be known as "motion pictures". Early motion pictures were static shots that showed an event or action with no editing or other cinematic techniques.

Steel Board

drawing easels


hk projector

Telescoping Easel


dia projector

headrest screen


horizontal screen

ioline plotter


Cutting Plotters

Telescopic Pointer


vinyl plotter

china globe


cut plotter

vinyl plotters


wooden globe

educational equipments


Graph Plotter

Valve Globe


Medical Apparatus

graphic plotter

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