Media College (Chương 2 : Ánh Sáng)(1)
Posted by tuyenphuc on 22 Tháng Ba, 2010
Chương 2: Ánh sáng.
Cũng như Chương 1 là Âm thanh, Chương 2 của Media College nói về phần kỹ thuật ánh sáng. Nhưng vì là Media nên bài viết thiên về ánh sáng kỹ thuật của thu hình (video), không phải Stage lighting. Tuy vậy, về phần cơ bản, 2 loại hình cũng giống nhau, đáng để tham khảo. (tuyenphuc).
Phần 1: Thuật ngữ ánh sáng.
Common Lighting Terminology
The light already present in a scene, before any additional lighting is added.
Ambient light means the light that is already present in a scene, before any additional lighting is added. It usually refers to natural light, either outdoors or coming through windows etc. It can also mean artificial lights such as normal room lights.
Ambient light can be the photographer’s friend and/or enemy. Clearly ambient light is important in photography and video work, as most shots rely largely or wholly on ambient lighting.
Unfortunately ambient light can be a real nuisance if it conflicts with what the photographer wants to achieve. For example, ambient light may be the wrong color temperature, intensity or direction for the desired effect. In this case the photographer may choose to block out the ambient light completely and replace it with artificial light. Of course this isn’t always practical and sometime compromises must be made.
On the other hand, many of history’s greatest photographs and film shots have relied on interesting ambient light. Unusual lighting can turn an otherwise ordinary shot into something very powerful.
Light seen directly from a light source (lamp, sun, etc).
Light seen after having bounced off a surface.
A standard of measuring the characteristics of light, measured in kelvins.
Colour Temperature Chart
Colour temperature is a standard method of describing colours for use in a range of situations and with different equipment. Colour temperatures are normally expressed in units called kelvins (K). Note that the term degrees kelvin is often used but is not technically correct (see below).
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