CHEF COOKING FOOD
A chef is a trained professional cook who is proficient in all aspects of food preparation, often focusing on a particular cuisine. The word "chef" is derived from the term chef de cuisine, the director or head of a kitchen. Chefs can receive formal training from an institution, as well as by apprenticing with an experienced chef. There are different terms that use the word chef in their titles, and deal with specific areas of food preparation, such as the sous-chef, who acts as the second-in-command in a kitchen, or the chef de partie, who handles a specific area of production. The kitchen brigade system is a hierarchy found in restaurants and hotels employing extensive staff, many of which use the word "chef" in their titles. Underneath the chefs are the kitchen assistants. A chef's standard uniform includes a hat (called a toque), neckerchief, double-breasted jacket, apron and sturdy shoes (that may include steel or plastic toe-caps).
Chroma key compositing, or chroma keying, is a special effects / post-production technique for compositing (layering) two images or video streams together based on color hues (chroma range). The technique has been used heavily in many fields to remove a background from the subject of a photo or video – particularly the newscasting, motion picture and videogame industries. A color range in the foreground footage is made transparent, allowing separately filmed background footage or a static image to be inserted into the scene. The chroma keying technique is commonly used in video production and post-production. This technique is also referred to as color keying, colour-separation overlay (CSO; primarily by the BBC), or by various terms for specific color-related variants such as green screen, and blue screen – chroma keying can be done with backgrounds of any color that are uniform and distinct, but green and blue backgrounds are more commonly used because they differ most distinctly in hue from most human skin colors. No part of the subject being filmed or photographed may duplicate the color used as the backing.