A standard unit of temperature measured relative to absolute zero, calculated by adding 273 to degrees Celsius or centigrade, used by photographers to measure colour temperature.
A term used to describe the effect of converging verticals. This is caused by the image plane not being parallel to the plane of the subject, for example, when a camera is tilted upwards to record an image of a building. The effect can be avoided by ensuring that the camera remains horizontal (for a vertical subject such as a building), and corrected using the \"transform perspective\" function in Photoshop or similar editing software.