Tuesday, February 18, 2014

How to make Portrait photography - Three point lighting

Portrait photography  is photography of a person or more  people that displays the expression, personality  and moods. Like other types of portraiture, the focus   is the person's face, although the  body , the background or context may be included.

Portrait photographs have been made since  the invention of the photo- camera. The relatively low cost of the daguerreotype in the middle of the 19th century and the reduced sitting time for the subject,  led to a  rise in the popularity of portrait photography over painted portraiture. The style of the early works reflected the technical challenges combined with long exposure times and the painterly aesthetic of the time. Subjects were  seated against plain backgrounds and lit with the soft light of an overhead window. Advances in photographic equipment and techniques developed gave photographers the ability to capture images with shorter exposure times.Than came the making of portraits outside the studio.


 The photo of Dr. Frederich Wolfert  ( German dirigible engineer ) shows lighting which was used in black - white photography

                                    Dr. Frederich Wolfert  , German dirigible engineer

When portrait photographs are  captured in a studio, the photographer has control over the lighting of the composition.  He can adjust direction and intensity of light. There are  are several main lighting plans which are  enough to describe.



Three-point lighting 
One of the  basic lighting plans is called three-point lighting. This plan uses three (also four) lights to fully model. This bring out details and the three-dimensionality of  the subject's features. The three main lights used in this light plan are :


Basic Three point lighting include three resources of light named - Fill light , Back light and Key light

                                                             Three- point lighting

Key light
Other named - Main light , the Key light is usually placed to one side of the subject's face.It must be  between 30 and 60 degrees off center and a bit higher than eye level. The purpose of the Key-Light is to give shape  to a subject. This relies on the first principle of lighting - white comes out of a plane and black goes back into a plane. The depth of shadows created by the Main-Light can be controlled with a Fill-Light.


Fill-light
In modern photography, the Fill-light is used to control the contrast in the scene and is nearly always placed above the lens axis and is a large light source (think of the sky behind your head when taking a photograph). As the amount of light is less than the key-light (main-light), the fill acts by lifting the shadows only (particularly relevant in digital photography where the noise lives in the shadows). It is true to say that light bounces around a room and fills in the shadows but this does not mean that a fill-light should be placed opposite a key-light (main-light) and it does not soften shadows, it lifts them. The relative intensity (ratio) of the Key-light to the fill-light is most easily discussed in terms of "Stops" difference (where a Stop is a doubling or halving of the intensity of light). A 2 Stop reduction in intensity for the Fill-Light would be a typical start point to maintain dimensionality (modelling) in a portrait (head and shoulder) shot.


Fill light placement scheme shows details of positioning of the object for shooting

                                                               Fill light placement

Today in  photography  the Fill-light is used to control the contrast in the scene and is nearly always placed above the lens axis. It is a large light source ( the light behind your head ). As the amount of light is less than the Key-light (Main-light), the Fill acts by lifting the shadows only (important  relevant in digital photography -  the noise lives in the shadows). It is true to say that light bounces around a room and fills in the shadows but this doesnt mean that a Fill-light should be placed opposite a Key-light  and it doesn't soften shadows, it lifts them. 


Back light
Background lights arent so much a part of the portrait lighting plan. It designed to provide illumination for the background behind the subject. Back lights can pick out details in the background, provide a halo effect by illuminating a portion of a backdrop behind the subject's head, or turn the background pure white by filling it with light.


 In Three point lighting  Back lights can pick out details in the background

                                                                       Back li




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